City Under the Sea

City Under the Sea is an episode of Thomas' Adventures of Thunderbirds Are Go ( 2015 TV Series).

Plot:
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 Paxton, 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.