What is the survival rate after 3 days?

• A. 91%
• B. 33.7%
• C. 19%
• D. 7.4%

Answer: (B)

Survival in a structural collapse is strongly time-dependent. The chances of a trapped person remaining alive drop as hours pass due to limited air, warmth, water, and increasing risk from injuries and environmental conditions. By the end of the third day, the data from urban search and rescue scenarios typically show about one-third of those initially trapped still alive, which aligns with around 33.7%. This makes that value a plausible and consistent estimate for day three.

The other numbers imply survival rates that are either unrealistically high for a 3-day scenario or too low given how some victims can still be rescued with access to air and positioning that allows rescue teams to reach them in time. The key concept is the sharp, time-driven decline in survival in rubble, with a notable but not impossible chance of rescue around the 72-hour mark.