QH-50 Dash anti-submarine helicopter.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
More: https://en.wikipedia.org/wiki/Gyrodyne_QH-50_DASH
Previously:
U.S. Navy submarine missile launch tubes - photo
steam-powered submarine
The H.L. Hunley, the first submarine to sink a warship
Narco-submarine captured by U.S. Coast Guard - video and infographic
Submarine drone captures lionfish - video
Submarine cutaway - photo
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