A few submarines have gone to the bottom of the Pacific Ocean, 6 miles down, but, most can only dive to a few hundred feet. Any deeper and the pressure would crush their hulls. Diving to a few hundred feet is good enough for most military and civilian submarines. Also, how deep certain military submarines can dive is top secret information and is known only to a few people in the navy.
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If we have 294 + 1277 here, it will equal 1571 feet. The reference is sea level, and the submarine is 294 feet below it. As the helicopter is at 1277, by adding 294 and 1277, we get the distance between the sub and the chopper, which is 1571 feet.
70 feet below sea level.
27 fps
28 feet contains 28 feet.
784 square feet