Is it okay for my wife that is 20+ weeks pregnant to go snorkelling? Anyone have good advise?

As long as she did it often before pregnancy. Pregnancy is not a gd time to try new sports.. I'm not a very paranoid person but in the event of an unexpected turn of events, an amateur has little knowledge of how to react n thus endangering 2 lives :) but if she is very confident , go ahead n don't worry her too much about it.