The World War II submarine USS Silversides is currently receiving its first dry dock preservation work in over 50 years. According to historians, the valve is likely the only surviving piece of the USS Trigger, a similar Gato-class submarine with a much more tragic fate than the Silversides. Named after the unnervingly toothy triggerfish, the Trigger launched from California’s Mare Island Navy Yard on October 22, 1941. The nearly 312-foot-long Gato-class submarine is now across Lake Michigan for its facelift in Sturgeon Bay, Wisconsin. The $3.5 million dry docking project will finish in October, ensuring the historic submarine remains seaworthy for at least another 15–20 years upon returning to its museum.