When the United States put the submarine USS Nautilus SSN-571 to sea in 1954, it was much more than a regular watercraft. Although being the largest submarine in its day the engine was the most impressive achievement: the SSN-571 was powered by a STR nuclear reactor making the vessel the first operational submarine impelled by nuclear power. Less than 3 years later the SSN-571 logged her 60,000th nautical mile and became a game changer during the Cold War. The Americans used this submarine in different training manouvers and generated a deterrent effect on their opponent. Thankfully, the vessel was never used to deliver it's full potential (by travelling undetected to the Soviet border and getting into battle position) but achieved another milestone in history. In August 1958 she completed the first successful submerged voyage around the North Pole within 4 days. Together with the Association of Veterans of US Submarine Service the brand new Vostok Europe SSN-571 Nuclear Submarine line was created. The main focus was to create a consistent design in the style of the real USS Nautilus that was decommissioned in 1980. Hence, the cases of the watches reflect the hull of the reactor. The hands are inspired by the on-board instruments. And the vertically aligned Tritium tubes provide a bright and clear illumination of the dial. The flexible and expandable silicon strap adjusts perfectly to any surface: either directly on the wrist or on firm/heavy fabric such as a diving suit. Naturally, the watches are 30 atm waterproof and were tested individually by the manufacturer. Each piece comes with a total of 2 straps (silicon and leather) in an original Vostok Europe Dry Box which also includes a tool to change the straps. NH35A Japanese automatic movement (manual winding possible ) Second stop function (for precise time adjustment) Very durable and reliable Power reserve: approx. 41 hours Date calendar with quick setting via the crown Shock protection Watch case: stainless steel Diameter: 46 mm Height: 15.6 mm Weight: approx. 130 g Water resistance: up to 30 atm. Glass: anti-reflective, hardened K1 crystal Crown: screw-in Case back: screw-in, with a 3D outline of the SSN-571 submarine Illumination: Swiss Made gaseous tritium light source (GTLS).The vertically mounted tritium tubes provide an enhanced illumination of the whole watch. The fluorescent time exceeds conventional illuminants by far. Additional illuminating coating on sub dials Unidirectional bezel with a diver's scale Engraved serial number 2 straps in total (leather and silicone): 1x pre-mounted strap, 1x additional strap Buckle: robust pin buckle out of stainless steel The strap can be removed with the included tool or with any 1 cent coin Impressed Vostok Europe log Original Vostok Europe Dry Box A booklet with the history of the submarine and description of whole SSN-571Nuclear Submarine watch line Tool for switching the bracelet/straps Warranty pass with operating instructions