North Korea has tested a new underwater nuclear-capable attack drone, Al Jazeera reported citing the country's state news agency KCNA said on Friday.

Significantly, the drone operated continuously for 59 hours underwater before being destroyed as part of a drill to intimidate the US and South Korean armed forces.

The North Korean military deployed and tested-fired the new weapons system this week during a military drill directed by Kim Jong Un, with the aim of determining if it could produce a deadly blast and wave on a "super-scale."

According to KCNA, "This nuclear underwater assault drone may be launched at any coast and port or operated while being towed by a surface ship."

As per several media reports, the nuclear-capable underwater attack drone tested by Pyongyang can also leash a "radioactive Tsunami".

The drone was placed in the ocean near South Hamgyong province on Tuesday as part of the experiment, and it drifted there for 59 hours and 12 minutes, at a depth of about 80 to 150 meters (260 to 490 feet), before exploding on Thursday in the waters of the province's east coast.

However, the South Korean news agency, Yonhap said that the drone's final target point was a mock enemy port set up in the waters of Hongwon Bay, Al Jazeera reported citing the media report.

The drone exercise comes as a US B-1B strategic bomber returned to South Korea to participate in the joint military exercise on Sunday, just 16 days after its previous deployment, as Pyongyang fired yet another ballistic missile into the East Sea, Yonhap news agency reported citing the defense ministry.

The drills took place in skies over the Korean Peninsula as part of the Freedom Sheild exercise that has been undergoing since March 13. The drills also include F-35A stealth fighter jets of South Korea and US F-16 fighters, according to the ministry.

Previously, a B-1B bomber was deployed to the peninsula on March 3, as per the Yonhap news report. The deployment was seen as a show of force against North Korea as Pyongyang fired a short-range ballistic missile toward the East Sea. North Korea fired the short-range ballistic missile three days after Pyongyang test-fired a Hwasong-17 intercontinental ballistic missile (ICBM).

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/ANI