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...