https://www.youtube.com/watch?v=gP6VnbeWXSY
Stowed in the coning tower the 3 man crew could assemble it very quickly in a few minutes it was designed to allow German IX D2 type U-Boats to better locate targets.
Climbing to around 700' it gave the pilot with a possible sighting distance of just over 20 miles, drawbacks were, revealing the U-boat visually and on radar, and possible loss of both pilot and craft in the event of a crash dive
Only U-Boats in the Indian Ocean used them as Allied naval superiority in the Atlantic Ocean had made surfacing in the daylight extremely dangerous.
A reproduction was made and apparent handles very well.
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