What I did on purpose that was dangerous and was to stop aging.

There was a big square structure I could see under the dirt and in the middle of it there was a small sqaure hole like 5ft by 5ft I could fall threw it if it didn't have a cap and I didn't know if the cap could hold me or not and then I stood in the middle of the sqaure hole that was 5ft by 5ft and didn't get hurt, I believe it prob had a rebar and concrete cap in it and I don't know how long it could hold up. I done this when I was 22 yrs old.