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In page Das Boot:
"Production for this film originally began in 1976. Several American directors were considered, and the Kaleun (Kapitänleutnant) was to be played by Robert Redford. Disagreements sprang up among various parties and the project was shelved. Another Hollywood production was attempted with other American directors in mind, this time with the Kaleun to be portrayed by Paul Newman. This effort primarily failed due to technical concerns, for example, how to film the close encounter of the two German submarines at sea during a storm.[citation needed]
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