Nutty Putty Cave in Utah was sealed up in 2009 after John Jones was trapped upside-down in a small crevice while spelunking. When rescue teams finally arrived he had been upside-down for so long that his legs were drained of blood.
The only possible way to have gotten him out was to break his legs, which would’ve sent him into fatal shock. He died after being trapped for 28 hours. His body’s still in the cave.