The MSM-03 Gogg is the first successful amphibious mobile suit produced by the Zimmad Company. The Gogg was needed to help secure Zeon's footholds in the Earth's oceans. The Gogg was heavily armored to withstand deep sea pressure. The mobile suit also held a powerful reactor, so powerful that the Gogg could even use twin mega particle guns mounted in its body. The Gogg, however, had no cooling systems and used the water as a natural heat sink. Lastly, the MSM-03 Gogg had ballast tanks also built inside the body, allowing it to travel fully submerged. The tanks could also hold water to cool the mobile suit's reactors during out of water operations, but as soon as the water ran out, its reactor would overheat, forcing it back into the water. The MSM-03 design proved marginally successful. However, it wasn't produced in a lot of numbers and was later replaced by more powerful and better designed amphibious mobile suits, such as the MIP Company's highly successful MSM-07 Z'Gok. The Gogg served as a base from which almost all other underwater combat mobile suits were designed.