Blind Fish: Locked in the Park

The Bio Park is the ultimate playground. A fully functioning ecological system almost a mile underground--later converted to an amusement park--it took years to build and hundreds of millions to develop. Unfortunately, it is losing money, so Linked Corporation has decided to seal the thirty foot doors with thousands of tons of blasted earth until the park has accrued in value.
The closing party drew a huge crowd of sightseers, thrill seekers, and partiers, even at a thousand dollars a head, but, perhaps inevitably, the doors closed on a small group of unfortunate stragglers. Under these terrifying circumstances--a limited food supply, little shelter, and few tools--these strangers will have to learn to work together. To some, staying alive means escape by burrowing through tons of rock, if necessary. To others, it means building a home out of a biosphere-turned-theme park.
Complicating their attempt to survive is their growing suspicion that they are being watched. Does someone know they are inside the biosphere and if so, what plans do they have for the small group of settlers? Under the eyes of possibly malign voyeurs, their decisions are crucial, because buried under the earth, mistakes are not forgiven, and time is running out.