  Submarine Explorer 1  From Bulbapedia, the community-driven
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Explorer 1 inside the Seafloor Cavern  The Submarine Explorer 1
(Japanese: かいえん ごう Kaien No. 1) is a submarine built at Stern's
Shipyard in Slateport City.  In the games  Team MagmaR or Team
AquaSE try to steal the submarine's plans twice before the
submarine can be built.  After the submarine is completed, Stern
reveals that its purpose is to explore the Seafloor Cavern, an
underwater cavern on Route 128. However, Team MagmaR or Team
AquaSE end up stealing the finished product and taking it to the
cavern themselves. The only time the submarine is visible during
the game is when it is parked in the entrance of the Seafloor
Cavern while the villainous team is inside. Inside the Seafloor
Cavern, one of the grunts remarks that the submarine is "brutal
as a ride" because of its small size. The submarine is not seen
again after the player clears the villainous team from the
Seafloor Cavern.  In