next time you're out on the open ocean check how far down into the water you can see, and then check out this graph [0] of electromagnetic radiation absorption

next time you're out on the open ocean check how far down into the water you can see, and then check out this graph [0] of electromagnetic radiation absorption of water: visible light is the best case scenario. there's a reason sonar is acoustic and not light based [0] http://hyperphysics.phy-astr.gsu.edu/hbase/Chemical/watabs.html http://hyperphysics.phy-astr.gsu.edu/hbase/Chemical/watabs.h...