Gavin Collinson wrote:

"If you take any training, you will realise that the
sea is a very unforgiving environment. "

I think you could argue the exact opposite. It's soft and no dangerous
in itself. You can make all sorts of mistakes in a yacht or powerboat
that would be fatal in a car or motorcycle.

Short of being tucked up in bed I think the sea is about the safest
place you can be!