As an example ... you're diving on a wreck at recreational depths. You and your dive buddy are moderately experienced, and both have OW, AOW and Rescue training only. You are diving standard AL80 rental tanks. At 90 fsw you come upon what looks like an easy entry to the wreck. Your buddy, without warning, decides to check it out and disappears inside the wreck.
What do you do?
(a) follow him inside
(b) wait just outside the wreck, hoping he re-emerges
(c) look around, hoping for another buddy team you can hook up with
(d) ascend to the boat and put in first dibs on your buddy's dive gear when they recover his body
(e) ... other (please state what you'd do) ...
By the way ... this is a real scenario. It happens fairly regularly, in fact, on the Nanaimo wrecks ...
... Bob (Grateful Diver)