Underground Waterway
The group leave for the village of Sakusa to find a Zoid mechanic, who is a friend of Ron's. However, they are forced to turn back after Rainbow Jerk runs out of Reggel. The city has been taken over by Digald forces, so Ruuji sneaks in and meets up with Haara. They form a plan to take Reggel from the Generator without Digald catching them. Garaga and Ra Kan distract the Bio-Raptor guards, and Ruuji retrieves the Reggel, but he is spotted by Zairin, and the Mega-Raptor leads a counter-attack against them.
Aired 29/05/2005EP 8 - Underground Waterway

Zoids Genesis
Natural disasters have devastated planet Zi, killing off almost all life. A thousand years later humans have gradually re-established civilization, salvaging ancient Zoids through diving and mining efforts. In a village whose most previous item is a giant sword which they worship as a holy symbol. A teenage boy discovers an ancient Liger-type Zoid while on a deep water salvage operation. Suddenly the village is attacked by skeletal Bio-Zoids intent on stealing a powerful generator located in the village. Our teenage hero awakens the Liger and discovers that the towns sacred sword is the Ligers weapon, together they fight off the mysterious Bio-Zoids. At least for now...
(Source: AniDB)