Is this what couse  the major destruction of  earth mantel..and mayby made one or two "new" continental plates here.hit-point..Marina Trench..world´s deepest point of the earth's oceans.

 The deepest point in each of the earth's oceans are as follows; the Arctic Ocean's Eurasian Basin at 5,450 meters (17,881 feet) deep, the Indian Ocean's Java Trench at 7,725 meters (25,344 feet) deep, the Atlantic Ocean's Puerto Rico Trench at 8,648 meters (28,374 feet) deep and the Pacific Ocean's Mariana Trench at 11,033 meters (36,201 feet) deep.

Watch this scene of  possible deep impact on earth