Even the most experienced scuba divers are not immune to that queasy feeling caused by the constant pitch-and-roll of a boat at sea or heavy surge underwater. Let's cover the boat part first. An ounce of prevention is worth a pound of last night's dinner all over the deck, you, and anyone unfortunate enough to be standing downwind of you. Even if you normally don't have seasickness, always carry something for it in your gear bag anyway. There's always that one time--for you or for your buddy or anyone else along. If you don't want to go the Bonine or Dramamine route-or pay the eight bucks American for a last-minute purchase at the resort scuba shop-Ginger is a proven, tried-and-true seasickness preventive. Even the T.V. show "Mythbusters" proved firsthand that crystallized Ginger taken beforehand outperformed popular seasickness drugs, wristbands and other remedies. You can find Ginger in pill form under food supplements at any drug or grocery store. You can also buy several slices of crystallized ginger for about $1.50 in the oriental food section. I prefer the crystallized; I feel like I'm getting more out of chewing the ginger (which tastes pretty good) than taking a pill. Some students of mine have complained that the Dramamine and Bonine tablets alter their perception and make them anxious. The bottom line is: be prepared ahead of time. Don't wait till you're already underway to discover that your chicken marsala dinner from last night suddenly wants to break free.
Seasickness underwater
Sometimes heavy surge (a rhythmic back-and-forth motion at depth) can cause queasiness. First, observe how the fish are dealing with it. You'll note that they do not try to fight, but are relaxed and going with the motion. Fighting against the sea is never a good idea! If relaxing and going with the motion doesn't sit well with you, abort the dive. If you have to throw up underwater, STAY CALM. You can throw up right into your regulator and purge it as you go. Be sure to keep the purge pressed down until you are finished. Try not to remove your regulator. The purge will clear the mess out for you.
Scuba Diving :: Seasickness
