You have to see the whole show, that clip didn't get the better views. There is one view where you see the shark swim past the bow of that party boat, it's massive! That whole show was chilling. A party boat hits some rocks in Shark Alley and starts to sink and help comes to rescue them but the folks are spread out due to current and theres a bunch of large sharks circling but then they all vanish. People in the water start getting picked off, one lady is holding onto a huge float then all of a sudden submarine breaches she and the float disappear. One guy is hanging onto some floating debris but then submarine starts literally nudging and pushing him further and further from the rescue boat, then all of a sudden he disappears.
In that clip a rescue diver is trying to save 3 people trapped underwater inside the boat, they found an air pocket. There are a couple better views of the shark and some brutal attacks shown, they show the ping from it on sonar as well and its like a baby whale. This shark was extremely smart and calculating. That rescue diver that eventually went in to try and save those people had to have huge brass ones to do what he did, especially knowing how big and cunning that shark was. The shark knew there were people still hiding in the submerged boat and was guarding it and started ramming it during the rescue.
The show was from Shark week 2014 "Shark of Darkness, Wrath Of Submarine" I just watched it a couple weeks ago, it was pretty intense.
