G-13

G-13 is one of the most notable Marine Bases located in Paradise, as well as the main home and headquarters of the infamous Hammer Troop. It is a mobile island, being drawn by small Sea Kings through the Grand Line wherever the staff deems it proper to go. The 'island' itself is a large platform, upon which a massive castle and small amounts of greenery cover most it. It is also slightly shaped like a crescent, and the edges of the crescent can connect, trapping ships inside.

Despite the base originally being lauded for being "impenetrable" and "unstoppable", it was eventually heavily damaged by The Marimo Pirates, who launched an assault on the base, willingly walking into the trap in order to rescue Nimbus, who had been captured by the Troop and the other Marines there in an effort to lure them out. The result was the defeat of most of the personnel in the base, including the Vice Admiral Hammer. It is considered by the Marines to be a massive defeat, especially since the crew managed to escape afterwards.

Following the Marine investigation into the activities that occured in the base, the base has been decommisioned and its name put back in circulation.