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All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
The Stena website says their ferry hits 23 knots en route. The submarine might not have fared well to have been hit by the ferry (170m sub vs 200m ferry)