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forzest tadalafil sold in europe Longer than a football field at 400 feet, the I-400 was known as a “Sen-Toku” class submarine—the largest submarine ever built until the introduction of nuclear-powered subs in the 1960s.? With a range of 37,500 miles, the I-400 and its sister ship, the I-401, were able to travel one and a half times around the world without refueling, a capability that, to this day, has never been matched by any other diesel-electric submarine.