Three deck crew on a superyacht tender were engaged in taking guests for a swim at sunset off some Caribbean islands.
The average depth was 2-5 metres, and you get a lot of shifting sands. The helmsperson was looking back, talking to guests whilst drifting, with one guest standing on the stern looking into the water.
One crew member noticed the echo sounder at a shallow depth, almost touching and immediately told the helmsperson, who reacted quickly by accelerating away. The guest fell backwards into the water with a near miss to the props! Fortunately, no one was hurt, but it could have ended badly. It is unclear if prop guards were fitted.