The name?
What Waits Below is the name of a "B" movie released in 1984.
Here is a summary of the plot line: The U.S. government has been
using deep caves in Central America as bases for a special type of
radio transmitter used for communicating with submaries. When the
signal from one of these transmitters suddenly disappears, a team
of soldiers and cave specialists is sent in to find out what
happened. After some exploring deep underground, they stumble upon
a tribe of albino cave dwellers who have been isolated from the
rest of the world for thousands of years.
So while you are looking for the cache, please be careful; be
very, very careful! What waits below for you is a small soupbowl
container about the size of a softball!