China’s naval buildup now includes a new class of attack submarine that employs both conventional and nuclear propulsion, according to defense officials.

In April 1963, the USS Thresher, a state-of-the-art nuclear-powered submarine, tragically sank during dive trials off Cape Cod, Massachusetts, claiming the lives of 129 crew members. -Despite its advanced sonar systems and the powerful S5W reactor,

According to information provided by "The Wall Street Journal," a new Chinese nuclear-powered submarine sank this year, potentially posing a problem for Beijing in the context of increasing its military capabilities.