Steelyeyes
Contributor
If I see a vessel headed my way I try to make eye contact with the operator. Sometimes it works. Sometimes not. Once my adult son (commercial salvage diver at the time) and I were shore diving in Cozumel. Two dive boats approached headed north after their dives, I assume. We made sure they saw us by waving. Their initial course would have put them close but they'd have passed. Right after that their course altered so there was zero angle on the bow, they were headed directly to us and we started swimming 90 degrees to their course and prepared for a rapid descent. Just as we were venting our BCDs the boats made a sharp turn to port and the operators gave us the one finger salute. We made the rest of our transit submerged.