Here’s what you need to know about the US Navy’s new deadly (and expensive) attack subs

The U.S. Navy inked a deal with General Dynamics Electric Boat on Dec. 2 to be the lead contractor for the newest iteration of the Virginia-class attack submarine.

The largest shipbuilding contract in the history of the service — in excess of $22 billion — the Navy has big plans for Block V. It is destined to be a true multimission submarine, with a strike capability and the ability to delivery large-diameter unmanned underwater vehicles in addition to the more traditional surveillance mission.