This video from the USA says about itself:
On May 5, 2012 our whale watching boat, Manute’a, encountered a rare Basking Shark off the coast of Dana Point. The animal was estimated to be about 20 feet long. These plankton eating sharks are the second largest fish in the world; only a whale shark is bigger. Whale watchers were awestruck when this huge shark turned and swam right up next to the boat!