THE CACHE IS NOT AT THE POSTED COORDINATES. It is a regular sized lock-n-lock placed on dry ground here:
The Ryukyu Trench (琉球海溝 Ryūkyū kaikō) is a 1398 km (868 mi) long oceanic trench located along the southeastern edge of Japan's Ryukyu Islands in the Philippine Sea between northeastern Taiwan and Okinawa. The trench has a maximum depth of 7460 m (24,476 ft). The trench is the result of oceanic crust of the Philippine Plate obliquely subducting beneath the continental crust of the Eurasian Plate at a rate of approximately 52 mm/yr.
The largest earthquake to have been recorded along the Ryukyu Trench, the 1968 Hyūga-nada earthquake, was magnitude 7.5 and occurred along the northernmost part of the trench on April 1, 1968. This earthquake also produced a tsunami.
The deepest spot in the Ryukyu trench is about 180 kilometers south of Okinawa at N 24° 29.569' E 127° 20.564'.
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