You're looking at the first-ever sonogram of a pregnant tiger shark. The baby sharks inside the mother shark's belly have been highlighted in the footage below so you can see them more easily. But even without the added outline and colour, you can very clearly see the sharks' heads and their very frightening rows of teeth. Amazing.
The pregnant tiger shark is 3.81m long and is carrying around 20 (!) little shark babies that look pretty damn developed and ready to roar from my perspective.