Lower Ice Cave 1
This cave is rather large in actuality, and is located at coordinates C-2NW, at a depth of 33 meters, or 108 feet. Within it, a salvageable Large Container is found.
Lower Ice Cave 2
Also located at C-2, but at a depth of 50 meters (164 feet), Lower Ice Cave 2 is a bit smaller than Lower Ice Cave 1 and contains no remarkable things.
Lower Ice Cave 3
Higher Ice Cave 1
Higher Ice Cave 1 is found at C-1 and a depth of 22 meters, or 72 feet, and is quite small. Within, you'll find a Small Box and the Virgo Coin.
Higher Ice Cave 2
Located at 22 meters, like HIC1, this cave quite big, more of a dead-end tunnel. A zoom spot in it contains several Sea Angels. When you use the Multisensor, you'll most likely find a Large Barrel. The Neptune Coin is found here as well.
Higher Ice Cave 3
Higher Ice Cave 3 is found at a depth of 21 meters, or 69 feet. Within it, if you use the Multisensor, you'll most likely pick up a Large Crate.