Under Pressure Digimon: Digital Monsters : Season 1 Episode 42

Under attack from MetalSeadramon, Whamon comes to the DigiDestined's rescue and they flee to the bottom of the ocean. Unfortunately, MetalSeadramon and his army of Divermon find them. Whamon and Zudomon destroy the Divermon, while WarGreymon battles MetalSeadramon.