named Sea Jet. The Advanced Electric Ship Demonstrator (AESD) Sea Jet, funded by the Office of Naval Research (ONR), is a 133-foot (40-meter) vessel located at the Naval Surface Warfare Center Carderock Division, Acoustic Research Detachment in Bayview, Idaho. Sea Jet was operated on Lake Pend Oreille, where it was used to test and demonstrate various technologies. Among the first technologies tested was an underwater discharge waterjet from Rolls-Royce Naval Marine, Inc. called AWJ-21. While underway during the spring of 2019, USS Zumwalt sailed through a storm causing sea state six conditions off the coast of Alaska. The test indicated that the Zumwalt class possesses greater stability compared to typical hull forms. During an interview, Captain Andrew Carlson, the commanding officer of USS Zumwalt at the time, related, "All told I'd rather be on that ship than any other ship I've been on." According to Captain Carlson, during the storm, he summoned his executive officer from his cabin to inform him of the sea state six conditions. Based on the rolls he had been experiencing in his cabin, the executive officer thought that, at most, they were at sea state three, where wave height only reaches a maximum of . A combination of the Zumwalt class's hull form, rudder stop locations, and propeller size contribute to its improved seakeeping. Secondary guns In 2005, a Critical Design Review (CDR) of the DDG-1000 led to the selection of the Mk 110 cannon to defend the destroyer against swarming attacks by small, fast boats; the Mk 110 has a rate of fire of 220 rpm and a range of . From then to 2010, various analysis efforts were conducted to assess potential cost-saving alternatives. Following a 2012 assessment using the latest gun and munition effectiveness information, it was concluded that the Mk 46 Gun System was more effective than the Mk 110 with increased capability, reduced weight, and significant cost avoidance. The Mk 46 has a rate of fire of 200 rpm and a range of . Naval experts have questioned the decision to replace the close-in swarm defense guns of the Zumwalt-class destroyers with ones of decreased size and range. The 57 mm can engage targets at two to three miles, while the 30 mm can only start to engage at around one mile. However, the DDG-1000 program manager said that the 57 mm round's lethality was "significantly over-modeled" and "not as