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How to increase visibility underwater
Selene is equipped with a skill called Area Scan. (press R3). This is very useful underwater, specifically in Biome 6. Use it when you're surrounded by the homing missile squid (Anomos) in addition to the lockdown rooms you might encounter. It becomes very helpful in the "challenge" rooms where you have to deal with multiple waves of enemies. Don't forget to use Area Scan if you're overwhelmed!