Radius Engineering International - S-20

The S-20, designed by Radius Engineering International, is explicitly engineered to safely shelter up to 20 people during severe weather events or blasts. It utilizes a high-strength fiberglass underground structure to protect against extreme winds and flying debris.

Radius Engineering constructs the S-20 entirely from structural fiberglass rather than traditional steel or concrete. This material choice prevents the underground shelter from rusting or corroding over decades in damp soil, ensuring long-term structural integrity.

Yes, the S-20 is classified as a severe weather and blast shelter designed to withstand significant overpressure and radiation. When buried at the proper depth, the surrounding earth and fiberglass composite massively reduce radiation penetration from radioactive fallout.

The S-20 comes equipped with a positive pressure ventilation system, commonly known in the shelter industry as a CBSS (Chemical, Biological, and Radiological) filter. This specialized ventilation ensures that inhabitants have safe, breathable air without drawing in contaminated outside air.