Longstone

The shot goes in close to the starboard boiler, where the depth is about 32 m, and it lands there reliably. From the shot the route runs forward past the boiler and over coal scattered on the seabed, then twists to port where the hull broke apart, and out to the bow, which stands upright with the cargo and anchor winches lying near it. This is the deepest point on the wreck, at about 33 m.

Turning back aft you pass a section of black-and-white tiled floor, the port boiler, the collapsed triple-expansion engine, and then the spare propeller and the emergency steering wheel toward the stern. Exposed to the current, the wreckage is covered with white and yellow dead men's fingers, with an army of sea urchins munching their way around it. A hole towards the top of the boiler gives a view in among the tubes, the kind of hole conger eels like to hide in.

The exit follows the propeller and rudder at about 27 m and then the reef slope, which ends at 20 m in a vertical wall running most of the way to the surface. That makes the ascent easy and removes any need for hanging decompression stops, and it leaves the shallow part of the dive for the soft corals on the wall and for the seals that hang around above the wreck.