Tidal Tempest

Tidal Tempest is the third round from the game Sonic the Hedgehog CD. It follows Collision Chaos and precedes Quartz Quadrant.

It is an underwater area at the base of a volcano. In the past it is an underground cavern, untouched by man or machine. The bad future shows a broken down, polluted, over-industrialized water plant. In the good future Tidal Tempest is a fully operational turquoise aquarium harboring much plant life and fish. The water level appears to have risen over time: it is low in the past, higher in the present, and at its highest in either future.