Mysterious creature filmed in the river Thames in London, UK

This was on the cable car in Greenwich on March 26, 2016. Something huge was moving under the water and then briefly surfaced.


Are there whales in the Thames or could it be a pod of dolphins?

Maybe, but there's still a huge shadow under the water that just looks like one giant sea creature with two large humps at the rear.

Whatever it is, it’s big.