Tigerman
Contributor
I havent done so myself, but I did have a guide once who signaled for everyone else to stay where they where while he swam off a few meters and he did, repeatedly throw up through his regulator..
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Not sure that "eat a good breakfast" is recommended. If you are going to puke, drink plenty of water in advance to replace what you will lose by puking. Eating a lot of fried eggs and bacon might make for a great fish attraction in the water, but I don't really think the undigested food will make you feel better when your stomach starts churning and wants to blow. IMHO, get the seasickness under control before you start eating a "good breakfast" before diving.