Dragon Ball Episode 47: Kame House - Found!
Episode 47 of 153 of Dragon Ball, aired January 21, 1987, 25 minutes. Available with English subtitles and dub where released.
Episode summary
As General Blue's men recover the scouts, Goku makes it to Roshi's island. Roshi offers the submarine (which Krillin and Launch are using) in exchange for Bulma's microband. Meanwhile Commander Red orders General Blue to take action. Roshi attempts to use the microband for some indecent mischief and Launch and Krillin return. While planning to find the dragonball Krillin mentions something about Pirates' Treasure and Master Roshi tells the tale of it. After Goku, Bulma and Krillin leave, a RR scout spies the island.