If you see a killer whale, 'never enter the water.'

Orcas keep attacking sailboats, and nobody is sure why.
The last three years have seen hundreds of boat-orca interactions off the coasts of Portugal, Spain, and Morocco, including attacks where the animals repeatedly ram a sailboat and cause damage. There was even one incident where killer whales sank a sailboat.
The flood of orca ambushes has prompted boaters and scientists to put their heads together and come up with guidelines for dealing with a killer whale attack.
If you see a killer whale, 'never enter the water.' What to do during an orca encounter, according to a whale expert.