Divers can be left behind by their boats when operators do not have proper counting systems. This has led to serious incidents, like the fate of Thomas and Eileen Lonergan, who went missing in Australia. Divers are encouraged to check the counting procedures of their dive boat before leaving. If someone is stranded, they should look for land, signal for help, conserve energy, and stay calm. It’s important to be prepared, as accidents can happen even with safety guidelines in place.