Multiple choice general knowledge science & technology Which is the Deepest sea Puerto Rico Trench in Atlantic Ocean Mariana Trench in Pacific Ocean Java Trench in Indian Ocean South Sandwich Trench in Southern Ocean Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Mariana Trench in the Pacific Ocean is the deepest part of the world's oceans, reaching approximately 10,994 meters (36,070 feet) at its deepest point known as the Challenger Deep. It is significantly deeper than any other oceanic trench.