Underwater Battlefield

Underwater Battlefield is the first cave you'll enter Relentless Spring in the game Pikmin:The After Years. This is an easy cave with a few tough enemies. There is a recognizable boss on the final sublevel. There are 10 sublevels with 17 treasures located here.

Enemies

 * Blue Bulborb
 * Dwarf Blue Bulborb
 * Bomborb
 * Dwarf Bomborb
 * Fiery Bulblax
 * Fiery Blowhog
 * Watery Blowhog
 * Supersonic Bulblax
 * Anode Beetle
 * Anode Dweevil
 * Poisonous Blowhog
 * Poisonous Burrow-nit
 * Mamuta
 * Hydro Mamuta
 * Unmarked Spectralids
 * Toadstool
 * Toady Bloyster
 * Boss Ranging Bloyster

After defeated, the Ranging Bloyster will give you the Pulsar Medallion.

-- Gamefreak75