US Navy photo by Mass Communication Specialist 3rd Class Kristopher Kirsop
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Navy SEALs swim back to guided-missile submarine USS Michigan during an exercise for certification on SEAL delivery-vehicle operations in the southern Pacific Ocean.
The US Navy's USS Michigan attack submarine arrived in Busan, South Korea's southern port city, on Friday, and it looks like it will be joined by a US aircraft carrier in a bold challenge to a defiant North Korea, Yonhap news reports.
The Michigan, a nuclear-powered attack submarine, carries with it some 150 Tomahawk cruise missiles that experts told Business Insider could prove incredibly useful in a strike on North Korea's nuclear infrastructure.
Additionally, the submarine is known to sometimes carry special forces. In April, South Korean media reported that Navy SEALs aboard the Michigan had trained with a local force to decapitate North Korea's Kim Jong Un regime.
The USS Ronald Reagan, the US's forward-deployed aircraft carrier based in Japan, also should head to South Korea in the coming days, according to Yonhap.
Additionally, the US Navy has reshuffled some Arleigh Berke-class destroyers to bolster missile defenses in the region.
Mass Communication Specialist 3rd Class Ryan McFarlane/US Navy
Aircraft, shooting stars, and planets are visible from the flight deck of the Navy's only forward-deployed aircraft carrier, USS Ronald Reagan, as it transits the Luzon Strait, July 1, 2016.
South Korea
When the US recently flew bombers over the Northern Limit Line, North Korea responded by saying it would shoot down US bombers even outside its airspace.
As a rule, the US Navy does not comment on future operations, but the Reagan has been spotted in Korea's vicinity recently.