The depth of a oceanic trench can vary. But the largest trench discovered is called the Mariana Trench that is 1,554 miles long, 44 miles wide and almost 7 miles deep, situated in the Pacific...
All the world's oceans, to a depth of about 3,000 feet, are home to this five inch long bizarre looking fish with the well-earned nickname "common black devil". It has its own flashlight (torch)...