This could be either a beach or boat dive, but the walk from the beach is a long one, and finding the Amtrack can be difficult.
From the beach, park behind the Agat cemetery and enter the water left of the pipeline. Set your compass to 270 degrees and swim out over the reef. Keep your depth to 25-30' to conserve air.
The main coral reef shoudl be to your left and there are lots of smaller sand areas below you as you head out. You should find the Amtrack in 50 feet of water. Even if you don’t the reef is very nice and worth exploring.
From a boat, you will descend directly onto the Amtrack, a personnel carrier sunk in WWII. Follow the channel away from the beach and you can go either way along walls covered with marine life.
The bottom of this area has many large sand pits surrounded by coral pillars and formations. There is abundant coral growth in the area, and this is one of only two areas on Guam where divers can see an amphibious vehicle that was part of the invasion fleet in World War II.
A good way to dive this area after seeing the Amtrack is to follow the wall at about 60 feet for the first half of your dive and then ascend to the reef flats at about 30 feet, which offers a varied dive including several cleaning stations teeming with fish.