Conversation so far:
what year did Harry Houdini do the buried alive stunt?
The first was near Santa Ana, California in 1915, and it almost cost Houdini his life.
how did he almost die?
He became exhausted and panicked while trying to dig his way to the surface and called for help.
When his hand finally broke the surface, he fell unconscious.
how long did the stunt last?
CANNOTANSWER.

Question: who came to help him?
Self-contained rewrite: Who came to help Harry Houdini after the buried alive stunt?