“Nethermost” was formed in English by combining “nether,” meaning “under” or “lower,” and the suffix “-most,” meaning “furthest.” The nethermost point on Earth is Challenger Deep, located nearly 7 miles below sea level at the bottom of the Mariana Trench in the Pacific Ocean near Guam. If the Mariana Trench were inverted and it became a mountain almost 36,000 feet in height, its uppermost points would be significantly taller than any of the highest mountains on Earth. Mount Everest is approximately 29,000 feet tall, and K2 is over 28,000 feet. Only two people have reached the nethermost areas of Challenger Deep by U.S. Navy submersible, while thousands of people have reached the uppermost point of Mount Everest.