That clip is from the second documentary first one was called mermaids: the body found and the second was mermaids: the New evidence. Both are very worth the watch even if some of it was fabricated for entertainment it still doesn't discount ancient legends of mermaids across multiple times, continents and civilizations. Remember we have less than 10% of the ocean yet almost every major civilization has some local legend or depiction of mermaids. In the second film they show footage from a uk training mission that caught one on tape s well