UaVaj
Contributor
in cases where there is a strong current, this is often caused by overexhaustion and over-breathing the reg induces a feeling that one cannot breathe and the diver may reject the reg at depth in this kind of situation and drown. In order for this to occur, you need a condition that induces the diver to feel that they cannot breathe in order to reject their reg. Overexertion with the build-up of CO2 which induces rapid breathing is the primary reason.
Reallie.