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What steps were taken to prevent detection due to air or gas escaping from tubes after launching?

April 26, 2017air detection ESCAPING Gas launching steps tubes

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What steps were taken to prevent detection due to air or gas escaping from tubes after launching?

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[Answer] Valves for return of air were used. Questions Submitted by Commander D.R.E. Brown, USNR: 1. [Question] What was the name of their [the Japanese] research agency investigating: (a) Light conditions. (b) Visibility – day and night. (c) Transmission of light through water. [Answer] No information. 2.