Patent ID: 11939792
Assignee: ATLAS SURVIVAL SHELTERS LLC
Field: Civil engineering (Other fields)
Classification: CPC E  F  Y | IPC E  F

Claim 10:
11. The underground shelter of claim 10 further comprising:
a stairwell having at least two stairwell panels, wherein one of the stairwell panels is a base stairwell panel connected to a bottom of the stairwell, wherein pairs of the at least two stairwell panels are affixed to each other along an interface, and wherein the at least two stairwell panels at least partially encompass an interior of the stairwell;
the stairwell having a primary entrance allowing for access to the interior of the stairwell, wherein at least one of the stairwell panels is angled upward and lined with stairs, wherein the stairwell is affixed to the entry room adjacent to the at least one secondary entrance, wherein the primary entrance is at least partial covered by a primary removable hatch, and wherein the stairwell is perpendicular to the entry room.