The massive walls seem to go for about 50 miles, but long ways is about 250 miles.
These anomalies could be an ancient Asian civilization that sank under the ocean long ago, (The western Pacific is home to some of the oldest seafloor in the world—about 180 million years old) but it also could be an underwater alien base.
Its size and location would insure millions could use it and since it’s in such a secluded area, few humans will ever see their UFOs leaving/entering the water.
Image left - Overview locations: Underwater Anomaly, Mariana Trench and Naval Base Guam. Click image to enlarge.
Near the underwater anomaly is the Mariana Trench, the deepest part of the world’s oceans and the location of the trench is almost to the center of the Earth.
Last year James Cameron made headlines by successfully diving 6.8 miles (11 kilometers) to the deepest part of the Mariana Trench. Despite Cameron’s record dive, it is impossible to know what really happens at the deepest part of the trench.
Also close to the underwater anomaly is the Naval Base Guam.
Naval Base Guam is a strategic U.S. naval base located on Apra Harbor, Guam. It is part of Joint Region Marianas, which is a Navy-controlled installation which was combined with Andersen Air Force Base in 2009. Naval Base Guam is home of Commander Submarine Squadron 15, Coast Guard Sector Guam and Naval Special Warfare
Here are the coordinates:15°40'27.59"N 146° 3'2.22"E (Google Earth.)
Thanks to: http://extraterrestrials.ning.com