Private boat to Mnemba. Out of Matemwe at 07:00, back on the beach at 12:30. You are paying for the hour. At seven there were two other boats on the reef. By nine there were fourteen. Visibility about 20 metres. Water 26 degrees. I wore a 3mm and did not need it. Current runs along the north side. Start up current and drift back. The boat picks you up. Do not swim into it. Dolphins are luck. We had six minutes. The boats full of people jumping in on top of them had less. Two hours in the water and nobody hurrying us back on board.