Does this sound familiar to you, divers?You've dropped thousands of dollars on a dive vacation to a beautiful tropical island. You got your gear serviced, you did a refresher in the pool at the resort yesterday to make sure all your gear was working properly and you read your scuba tune-up manual. On your first dive, your ears clear perfectly and you have a fabulous dive with turtles, rays and all the reef fish.On the second dive, you begin happily descending down the line and then it ...