This is the massive US nuclear submarine that just arrived off the Korean Peninsula

The USS Michigan, a nuclear submarine known for carrying special-ops teams, arrived in the South Korean city of Busan for what the Navy called a routine port visit last Friday, as tensions between the US and North Korea remain high.

The Michigan is an Ohio-class guided-missile submarine, one of four such US subs designated SSGNs.

In April, the last time the Michigan was in Busan, South Korean media reported it was carrying SEALs to train with South Korean forces to take out the North's nuclear command structure and leader Kim Jong Un, though the US military has said that it does not train for attempts at regime change.

The Michigan used to carry nuclear missiles but is now outfitted with Tomahawk precision-guided missiles.

Here's what it can do.