This has been around for a while and has been completely debunked. The people in it are actors and it is a movie of the fictional/factual/doco variety.

Perhaps, Paul, you should research things before posting-- I think if even I know for a fact that this video is a) old news and b) a fictional documentary, the veracity of the title is easily checked. I have even seen another doco that has the actor playing the Dr in this one! Sad though we may be, so far there are no mermaids wending their graceful Avatar type way around the oceans of the world, holding hands, falling in love and singing, long hair rippling through the water and large Hollywood breasts firmly delineated on at least half of the creatures. Sad but true.

And stop being so rude to Orac--- whose confusion seems to me to be more about the content of your posts than problems with language comprehension.