Dee ihe na-aga n'ihu maka paragraf a - Site na 2007 ruo 2011, a nwalere torpedo ọhụrụ na-emegide mmiri (nke mechara bụrụ torpedo Type 12). N'ọzụzụ nchekwa nchekwa PSI nke emere n'ọnwa Ọktoba 2007, a na-eduzi ọzụzụ nyocha na saịtị maka ụgbọ mmiri "Ikazuchi" na ụgbọ mmiri ahụ dị ka ụgbọ mmiri a na-enyo enyo. Na nzaghachi maka Oké Ala Ọma Jijiji nke East Japan
nke Tōhoku-Pacific Ocean Earthquake nke mere na 11 Machị 2011, o mere njem mberede na 15:45, nkeji 53 mgbe ala ọma jijiji ahụ gasịrị, iji zipu ọdachi. Ụgbọ mmiri ahụ nọ n'ọrụ ruo ụbọchị 21 nke ọnwa Machị, wee maliteghachi n'ụbọchị 26 nke ọnwa Machị, ma nọgide na-arụ ọrụ enyemaka ọdachi ruo ụbọchị 8 nke ọnwa Eprel.