Key features of this watch include:

1. Case: The watch boasts a substantial 49mm case made from 316L stainless steel, known for its durability and resistance to corrosion. The case is coated with blue PVD, giving it a distinctive and modern look. It has a thickness of 17.5mm, reinforcing its robust build.

2. Water Resistance: Impressively water-resistant up to 300 meters, this watch is well-suited for deep diving and challenging marine environments.

3. Helium Release Valve: A crucial feature for professional divers, the automatic helium release valve is integrated into the case. This spring-loaded one-way valve activates when there is a critical level of pressure difference, ensuring the watch's integrity at great depths.

4. Crystal: The watch face is protected by an enhanced 3.5mm thick mineral K1 crystal with an anti-reflective coating, offering both clarity and durability.

5. Illumination: The dial features Swiss-made tritium tubes mounted vertically or on the dial ring, providing superior and long-lasting illumination of the time indication.

6. Straps: It comes with custom leather and silicon straps that are easily interchangeable using a single tool included in the set. This allows for versatility and personalization according to the wearer's preference or activity.

7. Buckle: The watch features an original construction heavy-duty stainless steel buckle, ensuring security and resilience.

8. Packaging: The entire set is encased in an original VE waterproof and shock-resistant plastic box, which doubles as a secure container for valuables during extreme activities.

The watch has a sandwich-style dial with the date displayed at the 6 o'clock position. It also includes a unidirectional rotating bezel and a solid etched caseback, adding to its functional and aesthetic appeal.

Mounted on a blue silicon strap, the watch also comes with a blue genuine leather strap, offering additional styling options. The movement powering this timepiece is the Miyota 6S21 Quartz chronograph, renowned for its reliability and precision.

Overall, the Vostok Europe Lunokhod-2 Grand Chronograph Watch 6S21-620E631 is not just a timepiece but a testament to human ingenuity and resilience, designed to meet the demands of the most extreme environments and activities.