سوال ۲۰ کنکور ارشد مهندسی مکانیک ۱۴۰۰

PART C: Reading Comprehension

PASSAGE 1 (excerpt):

Challenger Deep got its name from the British survey ship Challenger II, which pinpointed the deep water off the Marianas Islands in 1951. Then in 1960, the US Navy sent the Trieste - a mini-submarine designed to go really deep - down into the depths of the Marianas trench to see just how far they would go. They touched bottom at 10,923m. If you cut Mount Everest off at sea level and put it on the ocean bottom in the Challenger Deep, there would still be over a mile of water over the top of it!

The pronoun "it" in paragraph 1 refers to ----------.