At home was several hours' hack-work waiting for him before he went to bed, and after he went to bed there was a volume of Weismann waiting for him, to say nothing of Herbert Spencer's Autobiography, which was as replete for him with romance as any thrilling novel.
The ocean's deepest area is the Mariana Trench (also called the Marianas Trench), which is about 11 km (almost 7 miles, or almost 36,000 feet) deep. The trench is 1,554 miles long and 44 miles wide, and is like the Grand Canyon of the ocean, although it is 120 times larger.
The deepest point in the ocean is, not surprisingly, in the Mariana Trench. It is called the Challenger Deep, after the British ship Challenger II, which discovered this point in 1951 while surveying. The Challenger Deep lies along the southern end of the Mariana Trench near the Mariana Islands. Various measurements have been taken of the ocean's depth at the Challenger Deep, but it is usually described as about 11,000 meters deep, or close to 7 miles beneath the ocean's surface.