Something pretty historic happened at Conley Terminal in South Boston on Saturday.

The USS Massachusetts, the Navy’s newest nuclear-powered submarine, was officially commissioned in Boston Harbor, marking a major moment for the city’s long maritime history.

According to the Boston Globe, the massive Virginia-class fast-attack submarine measures about 377 feet long and is powered by a nuclear reactor. It can travel at speeds over 25 knots, dive more than 800 feet, and is equipped with advanced weapons, including torpedoes and Tomahawk missiles.

The event featured all the traditional naval fanfare, including remarks from Navy officials and dignitaries, and local elected officials, including Maura Healy, plus the ceremonial “man our ship” moment—when sailors run aboard and bring the submarine to life.

 The USS Constitution also made a special appearance, sailing through the harbor in honor of the commissioning. The iconic warship even fired a 21-gun salute, giving the ceremony an extra layer of old-meets-new Navy tradition.

This is the first submarine ever named after Massachusetts, and it’s now part of the Navy’s active fleet.

You can read more details here.

Did you catch a glimpse of the USS Massachusetts or the USS Constitution on Saturday? 

Image via USS Constitution on Instagram