The RX-78-2 Gundam C-Armor is a mobile suit featured in the Solomon Express design series. It was designed by Makoto Kobayashi and featured in the September 1999 issue of Dengeki Hobby Magazine.
The C-Armor ("Sea" Armor) was an external device projected to improve underwater mobility and armaments of the RX-78-2 Gundam. Provided of lunar titanium harpoons and biological-type weapons, this configuration was intended to be used in the Solomon sea (Pacific Ocean, New Guinea area).
1/144 RX-78-2 Gundam with C(sea)-Armor model conversion based on 1/144 First Grade "RX-78-2 Gundam": modeled by Makoto Kobayashi for Solomon Express, Dengeki Hobby magazine
1/144 RX-78-2 Gundam with C(sea)-Armor model conversion: front view (Dengeki Hobby)