Upgrade! Lv2 Underground Shelter!

[Shabby Design Blueprint of Shelter]

[Description]: A inadequate shelter design blueprint designed by the inexperienced architect "Su Mo". Contains large and small architectural errors, 42 common sense engineering violations, 7 major defects, and 89 architectural violations. There are 27 minor defects, the planning is extremely unreasonable, most of the area is wasted, and the construction cost is huge. It is not recommended to directly proceed according to this plan.]

[First upgrade direction: Refactor the design of the shelter blueprint, greatly reduce common sense errors, retain the original design concept, and greatly improve the building's disaster resistance. Survival points required (120)]