Inside a submarine at test depth in the predawn Bering Sea is no place to be wondering what just hit you. Fortunately, the USS Rasher was crafted by Manitowoc master shipbuilders.
During World War II the Manitowoc Shipbuilding Company built 28 submarines at Manitowoc, Wisconsin. The first 10 were Gato -class, "thin-skin" boats, with test depths of 300 feet. Initial sea trials were done in Lake Michigan. Later the submarines were sent down the Mississippi River to New Orleans for final completion and fitting out.