The research station is located 100 meters below the surface of the water, yet when the shark destroys the panorama window and water rushes in, the room is miraculously not fully flooded and submerged. That makes zero sense, as that is not how water would function. It would fully flood the room.
The genetically altered shark in the movie is stated to be 4 meters long, however, when it lunges at the marooned people in the flooded research room, and jumps out of the water, the shark is just about the size of an adult male, and nowhere near 4 meters in length.