When the mission begins move directly forward and use the body slam to jump the mines. Do this a second time. Once you jump over the mines after the second time look to your left. Jump over a small field of mines and you will be in the area where you must kill the divers.

Use Shark Vision and look at the mines in the first row. You will see a green one. Destroy this mine and follow the path. You will keep finding green mines until you reach the sunken ships were the divers are located. Note: If you swim to the back of the mines at the start of the level and use Shark Vision you will see a lot of the mines turn green. There seems to be no way out of this area.