That is kinda eiree. At the begining there is definetly a large shape under the water. I don't know what to say, but I think that this might be it.

In April we were given a remarkable piece of footage. Although we have spoken to the person who took it on a number of occasions and are convinced of his veracity, he has asked to remain anonymous. We sent copies of the film to various members of our board of consultants, and sat back to await a verdict. We were not expecting every single person who has seen this video to give a different explanation for it. It has been described as a pair of otters, a water bird of some kind, a giant eel, men in diving suits and a pair of seals.