Aqua is a cancelled action adventure that was in development by Scavenger for the Sega Saturn and PC. Players would have been able to explore a sunken Mayan city under the sea, looking at fishes and other aquatic fauna. The gameplay could have probably been similar to Everblue (PS2) / Endless Ocean (Wii) by Arika or the Aquanaut’s Holiday series by Artdink, but sadly Scavenger’s Aqua was never finished. In 1997 the company had to close down for bankruptcy.
Thanks to Rod_Wod for the scan!