Lots of large Great Whites hang out at the Farollans.
That's what I was wondering - whether several whales could accidentally ram a 40-footer and do enough damage to sink it.
They seem to be kind of used to the sight-seeing boats, but this one was different - or maybe some different whales. Not sure *who* is there this time of year, whalewise. Some are year-round and others are transient visitors.