Three feet underwater.

[JumbleDuck]

My query was about the many comments I have read about yachts colliding with containers etc just BELOW the surface.

If you hit something, would you rather admit that you hadn't seen it or convince yourself that it must have been below the surface?

 

[capnsensible]

A submerged object may well find neutral buoyancy 3 feet underwater.

 

[macd]

I have seen it estimated that the Titanic's less fortunate passengers would have been doing about 30mph when they hit the sea bed.

Sensational nonsense, I'd have thought. Even with gases in the lungs and gut compressed, the human body has only slight negative buoyancy, nothing like enough to propel it at 30mph. Even the bow of the ship itself only hit the bottom at an estimated 13mph, the stern section much more slowly.