Ulrich Krieger - Aphotic I — Hadal (2023)

From Ulrich Krieger

that the regular depth for most recreational divers is 18 m. But already in shallow depths one can feel changes in perception and the slowing down of brain function—subjectively everything feels slower. My 60-minute dives feel like 20-30 minutes to me.

But underwater also has its own, different acoustic that irritates our senses and creates a new, unique experience. The speed of sound in salt water is 4 times faster than in air, resulting in a loss of directional hearing—sounds seem to come from everywhere, meaning we cannot orientate by sound anymore. Further there is the filter effect of water, making the underwater soundscape filtered, darker and quieter.