Pat Spain is used to doing things that he acknowledges are not normal — such as lying in a pit of 200,000 snakes or having a pygmy village take excessive interest in his bathroom habits. /Sea Serpents: On the Hunt in British Columbia/ chronicles the coolest thing this host of multiple wildlife-adventure TV series has done yet — traveling 1,000 feet underwater in a three-man sub. Follow Spain, and the National Geographic film crew that went with him, as he sets sail on a commercial fishing boat with a dozen angry men; plays a dangerous, absolutely bonkers sport; almost falls off a mountain while drunkenly hiking; and then some. Spain puts his marine biology degree to good use by getting drunk off the fumes of a pickled specimen of the largest bony fish on Earth, all in an effort to track down the truth behind stories of a giant Canadian sea serpent. The answer to the mystery probably isn’t what you’re thinking.