Thunderbirds Are Go Season 2 Episode 4 - City Under the Sea Episode Title:City Under the Sea.Episode Description:At Bay City, a town that was flooded due to global warming, the Mechanic, in a crab-like submarine, searches through the ruins of the Creighton-Ward building for a safe containing the plans for Parkmoor Scrubs prison so he can break the Hood out. As he smashes his way through some of the debris he collides with a rental sub hired by the Sullivan family causing it to crash onto the seabed. While Gordon and Kayo work together to rescue the family, Lady Penelope and Parker, using FAB 1's submarine mode, must reach the safe before the Mechanic gets there first.