Irl, the max the light can penetrate water is about 150 feet (42 meters). Though some light will still get reflected below this depth, no sea life that is dependant on light can grow below (generally speaking algae). Unless you're in clear blue water (like the south pacific) the areas that we mostly patrol aren't clear enough to see without an external light much more than 70 feet (using scuba diving as my guage, after 80+ feet usually need to bring a light). It's convenient that the game lets the observation scope do this, but not realistic once you start going deep.
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