It's deep. The hardest part about getting into the med, is establshing WHEN to dive. Eaasy to figure that out, just dive anywhere and see how long you can stretch your boat's o2 and batts. Mark the start point, and end point when you surfaced, that distance is your endurance. get your compass out, draw a few lines on gibralter and you'll know when you have to dive and about where you'll be when you'll HAVE to surface.
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