Within the span of a month, the expedition crew of the research vessel Petrel has discovered three naval ships sunk during World War II. The discoveries include the cruiser USS Helena, the aircraft carrier USS Lexington and the USS Juneau.

What is the significance of these discoveries and what’s made it possible for them to occur?

To learn more, The Show turned to Jon Simkins. He is the managing editor of Military Times and has been following these discoveries.