Somewhere in the depths of the Pacific Ocean, sometime in the last few weeks, the USS Jimmy Carter carried out an important mission for the nation. It was probably related to spying.

Here’s what we know. On Tuesday, a sharp eyed journalist, Ian Keddie, noted that the Seawolf-class attack submarine, USS Jimmy Carter, had returned to its Washington port while flying the Jolly Roger pirate flag. The Navy, whether by accident or by design, published the photo online.

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