I have heard refernce to people who use ear plugs when diving. I have a friend who wants to learn to dive, but needs to keep water out of his ears do to a medical condition (yes, he can equalize his ears but needs to keep water out). Is it possible to dive with dive specific plugs? Or would he need to use a helmet-like mask to keep water out. Any refernces or help would make his day. He loves to snorkel and really wants to learn to be an Open Water Diver. -Starfish