i don't know? but i found this:

Rogues come about in different ways, but are almost always generated by storm-related winds, whether near or far.

"The winds transfer energy into the waves," said Peter Challenor, an oceanographer at the National Oceanography Centre in Southampton in Britain.

"Then you get interactions among the waves, with the large ones taking energy from the smaller ones, getting bigger and bigger in the process," he said by phone.

The highest wave ever recorded on the high seas is a 34-meter (112-foot) monster spotted in the Pacific by a U.S. Navy-chartered tanker in the 1920s.

[link to news.discovery.com]

the 200 supertanker comment leads me to believe "insurance scam" of high seas proportions