Every year scuba divers throughout the world get lost at sea and a few end up dying or never discovered. The majority of these divers sign up for a diving excursion on a tour ship and due to inexperience, lack of common sense, neglect, and just plain bad fortune are subjected to the worse encounter in their own lives.
A number of these divers are swept away by currents, get separated from the other divers or experience undesirable underwater conditions that affect their sense of direction and time. The problem is that the tour boat operator might be less worried about divers safety than keeping on schedule.
And if you've got a problem there are no lawyers that will sue someone. Basically, you are in your own or when you're diving with somebody then it's imperative that you look out to each other throughout the dive.
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Don't drift off, be conscious of in which the dive master is at all times, keep your eye on your other fellow sailors, be conscious of the strong currents which may move you in over 5 miles an hour, when you surface deploy your BC and look for the dive boat and other divers, have a signaling light or safety light with you.