Dread - S1.E4

Natalie and her friends, Louise and Wendy, perform their malevolent prank on Maila, trapping her on a boat in the middle of the sea, but their plan goes awry when a fight breaks out on board and in an attempt to hurt Maila, Natalie accidentally hits the engine, causing it to explode as sending them into the ocean. Things become even worse when Maila and Natalie both get swept away by the strong waves and wash up on the shore of a deserted island.