Undersea Shelter (シェルター, Shieruta?) is a location in Final Fantasy Legend III. The Undersea Shelter is located to the north of Viper City, Arthur meets up with Dr. Pulcer. The plan is to use the Rocket at the pier near the Palace and fly up to Floatland when it passes by.
Then retrieve both the X-Plane unit from Maitreya and locate the Remote. Once both items are retrieved, call Dr. Pulcer on the Radio so that he can blow up the Palace and free the Talon, than Arthur calls the ship from Floatland to them by using the Remote.