Originally Posted by Architeuthis
Paint the bottom to look like a Physeter macrocephalus, that would get my attention! Of course you still might have an Orcinus orca problem.
There is no easy solution other than to build the boat tough enough to take the hit.
Physeter Macrocephalus if you wish but probably not a female.....
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett