7. Surcouf – France
Producer: Château de Cherbourg Arsenal
The French Navy and Free French Naval Forces are the main users.
* Price: $500 million to $1 billion
This submarine was part of the Free French Naval Forces and the French Navy. The Surcouf was lost at sea in mid-February 1942, having served in World War II. Her disappearance in the Caribbean Sea sparked a plethora of theories about the Bermuda Triangle.
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Reddit.com/@u/Tsquare43 Surcouf
It's possible that Surcouf ran into an American freighter, which would have perished in the collision as well. Her demise was unexpected because she was the largest cruiser submarine the French Naval Forces had at the time. Although no one has dove to verify the wreckage to date, if its sinking location is accurate, it is 9,800 feet below the sea's surface.
8. BV XCH-62 – USA
Producer: Boeing Vertol
Main Users: United States Army (Positive)
Price: N/A (never made)
The U.S. Army was to employ the Boeing Vertol-built BV XCH-62, also known as the Model 301, which was a heavy-lift helicopter. The military vehicle was sanctioned in the 1970s, and only one prototype was made. In 2005, the concept was formally sent to the trash heap.
Pinterest, Rod808, and BV XCH-62
The XCH-62 was designed to support the Chinook, which was outclassed by the Soviet Union heavy-lift helicopters in terms of payload capacity. Soviet helicopters could lift 44,000 pounds; the Chinook could only carry 28,000 pounds. Despite multiple attempts to complete the project, the XCH-62 was ultimately determined to be excessively costly. Congress refused to fund it in 1989 because one helicopter would have required $71 million, and things have gotten worse since then.
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