Tom is with his father on a ship to test a new submersable, everything is going just fine when an unexpected storm hits and they lose contact with his father. Tom gets in hi research sub and goes down to look for his father. time is limiteed for tom and he must find him quick. Tom finally finds the location where his father is and sees that his fathers sub is stuck, so Tom must get it out. after a while of trying to get it out, he finally does and gets his father to safety.
I loved it, you should read it