Warriors From The Sea. Mark XI / 11 / Eleven. Antique Silver Version / Only 30 Made. This coin is 3 inches in diameter. This is coin is a beauty. Only 30 Made by command of the Antique Silver Version. The SDV was intended to be replaced with the. (ASDS), a larger, dry submersible that is often confused with the SDV. And the swimmers ride exposed to the water, breathing from the vehicle’s compressed air supply or using their own SCUBA gear, while the ASDS is dry inside and equipped with a full life support and air conditioning system. The ASDS was canceled in 2009 due to cost overruns and the loss of the prototype in a fire. The Navy currently plans to replace the SDV with the. Shallow Water Combat Submersible. (SWCS), which will be designated the Mark 11 SDV. The SWCS is expected to enter service in 2019. Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless otherwise specified above. The free listing tool. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “rolyat11″ and is located in this country: US. This item can be shipped worldwide.