Answer: this is hardly worth the trouble but basically one way distance \u2248 a \u394t\2 = 1457 (15/2) \u2248 10900m
Explanation:
it probably makes little difference but estimated at depth 800 meters, p=101350 +1025 (9.81)(800) = 8.15E6 Pa= 80.4 atm p/pa= 80.4 = 3001 ... :/
if you need to show your work follow me on instagram (just.makelo) and and ill show you how to work it out.