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257.79 leas is about one-and-three-fourths times as as The Challenger Deep (Marianas Trench).
In other words, it's 1.7298 times the of The Challenger Deep (Marianas Trench), and the of The Challenger Deep (Marianas Trench) is 0.5781 times that amount.
(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 149.03 leas below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.
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