Dive guides written from published sources, with every claim linked.https://reefwander.com/enhttps://reefwander.com/guides/where-to-dive-month-by-month/https://reefwander.com/guides/where-to-dive-month-by-month/The shape of the diving year from our records: which seas open in each month, which close, and the places at their best from January to December.Sun, 20 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/decompression-sickness/https://reefwander.com/guides/decompression-sickness/Where the bubbles form, where they lodge, the symptom ladder and its clock, and what a chamber actually does — drawn from a working decompression model.Sat, 12 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/diving-with-seals-and-sea-lions/https://reefwander.com/guides/diving-with-seals-and-sea-lions/Where seals and sea lions come to divers, how deep and how hard each colony dive is, when each one runs, and why the pupping season is the wrong season.Sat, 12 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/how-a-rebreather-works/https://reefwander.com/guides/how-a-rebreather-works/A closed-circuit rebreather uses the same oxygen at 60 metres as at 6. Here is the arithmetic behind that, what the loop actually buys, and what it costs.Wed, 09 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/blackwater-diving/https://reefwander.com/guides/blackwater-diving/What blackwater diving is: drifting over thousands of metres of open ocean at night, on a tether or lit downline, as the largest migration on Earth rises past.Sun, 06 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/how-deep-can-you-dive/https://reefwander.com/guides/how-deep-can-you-dive/How deep can you scuba dive? Every limit, computed: 18 m training, 33 m gas density, 40 m no-stop, 56.5 m air ceiling, then trimix, the 332 m record, the floor.Sun, 06 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/wetsuit-thickness-by-water-temperature/https://reefwander.com/guides/wetsuit-thickness-by-water-temperature/A wetsuit thickness guide computed, not copied: the watts a 3, 5 or 7 mm suit leaks at each water temperature, at the surface and at 20 m, band by band.Sun, 06 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/why-you-pee-when-you-dive/https://reefwander.com/guides/why-you-pee-when-you-dive/Why do I have to pee when diving? Water pushes up to 700 mL of blood into your chest, the kidneys dump the surplus — and the first reason you tire after.Sun, 06 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/when-the-reef-spawns/https://reefwander.com/guides/when-the-reef-spawns/Corals, groupers, snappers and palolo worms all spawn on the moon's schedule. The calendar, the dives timed to it, and why it is so dangerously fishable.Sat, 05 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/bioluminescence/https://reefwander.com/guides/bioluminescence/Most of the deep sea makes its own light, the flash is tuned to 476-nanometre blue — the colour seawater carries farthest — and any night dive can show it.Wed, 02 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/the-layered-sea/https://reefwander.com/guides/the-layered-sea/Water sorts itself into layers by heat and salt. Why lakes turn over at 4 °C, why haloclines blur your view, and the 2 kg buoyancy step a cenote hands you.Wed, 02 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/tides-and-slack-water/https://reefwander.com/guides/tides-and-slack-water/The tide is a wave with a 12.4-hour clock. Why slack belongs to the stream, not the height — and why an 8-knot channel gives you fifteen diveable minutes.Wed, 02 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/who-actually-stings-you/https://reefwander.com/guides/who-actually-stings-you/Nothing down there hunts divers. Nearly everything that hurts is stationary, camouflaged and defensive — the injury happens when you tread, brush or grab.Wed, 02 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/why-some-seas-are-green/https://reefwander.com/guides/why-some-seas-are-green/Sea colour, computed: chlorophyll closes the blue window, the sunlit zone collapses from 124 m to 10, and the green water is where the food is.Tue, 01 Sep 2026 00:00:00 GMThttps://reefwander.com/guides/best-night-dives/https://reefwander.com/guides/best-night-dives/The night dives worth travelling for — Kona's manta feed, blackwater, mandarinfish at dusk, bioluminescence, coral spawning — and how each one is run.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/big-shark-dives/https://reefwander.com/guides/big-shark-dives/Where divers meet tiger, bull and great white sharks in 2026 — the sites that still run, the ones that closed, and what the feeding science shows.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/blue-holes/https://reefwander.com/guides/blue-holes/Blue holes are drowned ice-age caves. The science of their layered water, the ones you can actually dive, and the record depths no human has visited.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/diving-at-altitude/https://reefwander.com/guides/diving-at-altitude/No-stop limits computed for a surface at 1,500 and 3,000 m, the Cross correction — and why the model in your dive computer was built for mountain lakes.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/mola-mola/https://reefwander.com/guides/mola-mola/Bali's sunfish are mostly a different species than the name suggests. Where sunfish diving is a real season — Nusa Penida, the Galápagos — and where it is luck.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/oxygen-clock/https://reefwander.com/guides/oxygen-clock/Where the 1.4 bar oxygen limit actually comes from: wartime trials, the NOAA exposure table, and a chosen margin below a threshold nobody can predict.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/surface-intervals/https://reefwander.com/guides/surface-intervals/What an hour on deck actually buys back, computed compartment by compartment — and how a 1956 bookkeeping convention became diving's most repeated rule.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/swimming-with-whales/https://reefwander.com/guides/swimming-with-whales/Swimming with whales is legal in only a handful of places, all of them snorkel and all of them permits. How each program runs, and where the answer is no.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/thresher-sharks/https://reefwander.com/guides/thresher-sharks/The world's only reliable daily thresher shark dive moved from Monad Shoal to Kimud Shoal in 2022. Where the sharks are now, and how the dive is run.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/waves-and-surge/https://reefwander.com/guides/waves-and-surge/Wave physics for divers, computed: why wind chop dies by 7 m while a 14-second swell still moves you at 40, and why the safety stop is the roughest part.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/what-a-safety-stop-does/https://reefwander.com/guides/what-a-safety-stop-does/Three minutes at 5 m, computed compartment by compartment — what the stop changes, where the number came from, and when to skip it.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/why-the-water-steals-your-heat/https://reefwander.com/guides/why-the-water-steals-your-heat/Water takes body heat 25 times faster than air. Computed: what every breath costs at depth, and how a 5 mm wetsuit becomes a 2.9 mm suit at 30 m.Mon, 31 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/buoyancy-and-weighting/https://reefwander.com/guides/buoyancy-and-weighting/What a wetsuit is really worth, why every cylinder swings by the weight of its air, and why the belt that felt right on the bottom fails at the safety stop.Fri, 28 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/flying-after-diving/https://reefwander.com/guides/flying-after-diving/What a cabin at 8,000 feet does to you, what the decompression model says about it, and why DAN's 12 and 18 hours come from chamber trials, not arithmetic.Fri, 28 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/gas-density-and-narcosis/https://reefwander.com/guides/gas-density-and-narcosis/Breathing gas density has a published limit most divers have never heard of. Air passes it at 33 metres, nitrox slightly sooner, and only helium moves it.Fri, 28 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/how-long-a-tank-lasts/https://reefwander.com/guides/how-long-a-tank-lasts/Surface consumption, what depth does to it, the reserve two divers need to reach the surface, and why the cylinder rather than the computer ends most dives.Fri, 28 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/why-the-sea-is-blue/https://reefwander.com/guides/why-the-sea-is-blue/Water absorbs red light about 140 times more strongly than blue. What that does to colour as you go down, computed from the physics, and what a torch puts back.Fri, 28 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/why-your-ears-hurt/https://reefwander.com/guides/why-your-ears-hurt/The pressure across your eardrum, the clinical thresholds in metres, every equalisation technique that works, and the point at which you call the dive.Fri, 28 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/cold-water-diving/https://reefwander.com/guides/cold-water-diving/Ice, kelp forests, hydrothermal chimneys and 80 m of visibility — 55 cold-water dive sites from Antarctica to Tasmania, and what the drysuit costs.Thu, 27 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/deep-wrecks-recreational-limit/https://reefwander.com/guides/deep-wrecks-recreational-limit/Fifty-three wrecks past 30 metres, sorted by the depth they ask for: the recreational edge, the decompression band, and the trimix ground past 60 m.Thu, 27 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/diving-on-a-budget/https://reefwander.com/guides/diving-on-a-budget/Cost per dive, not sticker price: the cheap certification hubs, shore-diving islands and budget liveaboard regions where the diving is good, and the catch.Thu, 27 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/freshwater-diving/https://reefwander.com/guides/freshwater-diving/Springs, cenotes, alpine lakes, flooded quarries, river drifts and Great Lakes wrecks: where freshwater diving is a destination, and what changes without salt.Thu, 27 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/how-your-dive-computer-decides/https://reefwander.com/guides/how-your-dive-computer-decides/Decompression made visible: tissue compartments, M-values, no-stop time and gradient factors, drawn live from a working Bühlmann ZH-L16C model.Thu, 27 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/whale-sharks-month-by-month/https://reefwander.com/guides/whale-sharks-month-by-month/Thirty-nine whale shark sites, split into the aggregations you can book a date against and the seamounts where a sighting is luck, with the months for each.Thu, 27 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/air-nitrox-trimix/https://reefwander.com/guides/air-nitrox-trimix/Every gas divers breathe: air, nitrox, trimix, heliox, hydreliox and rebreather diluents — what each one fixes, what it costs, and where the answer changes.Tue, 25 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/oceanic-whitetips/https://reefwander.com/guides/oceanic-whitetips/Oceanic whitetips are dived in a handful of places, ten of them Egyptian or Sudanese. Where they are, why autumn concentrates them, and how the dive is run.Mon, 24 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/drift-diving/https://reefwander.com/guides/drift-diving/What a drift dive really asks of you, how to read a tidal pass before you get in, the three skills that matter, and 26 sites where the current is the dive.Sat, 22 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/diving-with-a-dpv/https://reefwander.com/guides/diving-with-a-dpv/What a diver propulsion vehicle changes underwater, how to plan range and gas around one, the sites where it earns its place, and where scooters are banned.Thu, 20 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/cenotes-and-caverns/https://reefwander.com/guides/cenotes-and-caverns/Thirty-one overhead dives for recreational divers — cenotes, springs, sea caves and coral caverns — and the famous holes you should only look into.Mon, 17 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/manta-rays-month-by-month/https://reefwander.com/guides/manta-rays-month-by-month/Twenty-two manta sites — cleaning stations, feeding channels and the Kona night dive — with the months each works and how to behave when a ray comes to look.Fri, 14 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/best-muck-diving/https://reefwander.com/guides/best-muck-diving/The muck capitals — Lembeh, Ambon, Dauin, Anilao, Milne Bay — the temperate piers that rival them, what an hour over black sand turns up, and how to dive it.Wed, 12 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/hammerheads-month-by-month/https://reefwander.com/guides/hammerheads-month-by-month/Twenty places where scalloped and great hammerheads are reliably seen, with the months each one works, the depth and current involved, and how the dives run.Sun, 09 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/wwii-wrecks-you-can-dive/https://reefwander.com/guides/wwii-wrecks-you-can-dive/The 49 Second World War wrecks in our guides that recreational and technical divers can visit, by theatre, with depth, level and the best months for each.Thu, 06 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/liveaboard-or-resort/https://reefwander.com/guides/liveaboard-or-resort/An honest comparison of liveaboard and resort diving: cost per dive, dives per day, who each suits, seasickness, non-divers, and where each one wins outright.Tue, 04 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/best-shore-dives/https://reefwander.com/guides/best-shore-dives/Sixty dive sites you walk into from a beach, a jetty or a flight of steps, from the Red Sea to Iceland, with depth, level and the best months for each.Sat, 01 Aug 2026 00:00:00 GMThttps://reefwander.com/guides/your-first-wreck-dive/https://reefwander.com/guides/your-first-wreck-dive/What makes a wreck a good first wreck, what the dive feels like, what to leave for later, and 26 shallow, intact, easy-access wrecks in warm and cold water.Wed, 29 Jul 2026 00:00:00 GMT