A recent (Jan 8, 2020) report in the BVI BEACON newspaper details the tragic story of two incidents wherein persons in the water were run over and killed by other vessels.
These events highlight the importance of taking preventative action when in the water. Many charter yachts come equipped with inflatable orange beacons that attach to an ankle with a Velcro strap. Or, as in the photo, you can wear a fluorescent yellow vest that can be inflated to support buoyancy if required.
Now, these may not look graceful or conducive to deep dives. But they just may save a life.
So be careful out there!
https://www.bvibeacon.com/after-swimmers-killed-call-made-for-change/