The South Korean military dismissed North Korean claims about its newest military capability on Monday, calling state media reports about an undersea nuclear attack drone “exaggerated and manipulated.”

The DPRK’s Korean Central News Agency (KCNA) revealed the “Haeil” drone in a report last Friday, stating that Kim Jong Un personally inspected the equipment and claiming it is capable of generating a “radioactive tsunami” against U.S. and South Korean forces.

But South Korea’s Joint Chiefs of Staff assessed this was highly implausible.

“After comprehensively reviewing U.S.-ROK authorities’ analyses and expert views regarding the substance of what North Korea said was a