What is the primary advantage of using a portable surface-supplied diving system like the MK-20?

The primary advantage of using a portable surface-supplied diving system like the MK-20 is the capability for longer dive times without the need for decompression. These diving systems provide a continuous supply of breathable gas from the surface, allowing divers to stay underwater for extended periods compared to conventional scuba gear, which relies on compressed air stored in tanks.

This continuous gas supply reduces the risks associated with prolonged exposure to high pressure and allows for a more efficient management of dive profiles, significantly minimizing the likelihood of decompression sickness. Additionally, because the diver can maintain a steady flow of air during the dive, they are less likely to exhaust their air supply—an important advantage for deep or complex dives.

In contrast, options focusing on reduced visibility, air consumption rates, or depth capabilities do not highlight the primary benefits of surface-supplied diving systems in the way that dive duration and safety assurances do.