I wonder how this happened.

[underwateraddict]

I would have many questions.  Did they have a sufficient drag line trailing the boat?  Did they have a compass?  Having a line from the  bow to the stern saves energy getting to the desent line.  Know the current before submerging.  Do not get lost and if so surface before your air runs low then resubmerge and dive up current along the bottom.  Enough said.