The submarine descends 15% of a total depth in 1 minute, so it descends 15/100 * 45 = <<15/100*45=6.75>>6.75 feet per minute.
After 4 minutes, the submarine will have descended 4 * 6.75 = <<4*6.75=27>>27 feet.
Therefore, the submarine will be at a depth of 45 - 27 = <<45-27=18>>18 feet after 4 minutes. Answer: \boxed{18}.
A submarine is diving to a total depth of 45feet. It descends 15% of a total depth and in 1 minute .How deep will the submarine be after 4 minutes?
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