You decide to go Scuba diving in the ocean, you lower more as the sun's rays light the ocean below... So much tropical fish, and sea life. You keep going more down... It's getting much darker as you go down, as the coral is covering most of the sun's rays. You're breathing out your oxygen tank, as you've got a couple hours of oxygen left. The many tropical fish are quite nice to look at, and the water is slowly getting warm as your body adjusts. You see a small glint appear, before fading fast