with a baseball bat the size of a tree. >> the day starts out calmly for two experienced divers, danny morrowim cosmic. morrow's had his share of close encounters. as we just witnessed, a massive octopus put the squeeze on his good friend, doug pemberton. that close call turned out okay as doug clawed his way to freedom at the last second. morrow has been around the world and back again, filming the wonders of the world's oceans. his goal on this expedition is to videotape mating humpback whales in the waters of the silver banks whale sanctuary. >> literally on the last day of the trip, we stumbled onto a young male and a young female and they were courting, and they were oblivious to us. they just let us do what we wanted. they weren't full-grown adults. they were -- i guess for lack of a better analogy, they were teenagers, and they were amorous teenagers, and they were cavorting like teenagers do. >> but, remember, these aren't like your typical adolescents. humpback whales are one of the largest species on the planet. they grow up to 50 feet in length and weigh almost 79,000 pounds. norma