Brine Cave (Japanese: いそのどうくつ Beach Cave) is a dungeon in Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky. It is unlocked after the player talks to Torkoal when he visits the guild, the player's partner shows him the Relic Fragment's pattern, and Wigglytuff and Chatot reveal the location of the pattern. On the first visit, Chatot will accompany the player. It has 15 floors total, with a relay point between the 9th floor and the first floor of Lower Brine Cave. At that relay, Chatot will chase after the Team Skull, leaving player and player's partner behind. The boss Pokémon are two Omastar and a Kabutops, who terrorized Wigglytuff and Chatot in the past. Earlier in the game Wigglytuff is seen talking to Lapras about letting the player travel to the Hidden Land.
Along the way though this dungeon, players will encounter as many traps as they did in Treeshroud Forest.
Poké encountered here is found in packs of 3-104. There seems to be no connection to items and floor.
Wigglytuff's Guild in the Brine Cave's entrance
Lower Brine Cave. Note that Chatot is missing.
Last floor, where Kabutops and Omastar are encountered
Kabutops and Omastar at the ceiling
Pattern at the end of dungeon, same as on Relic Fragment