CARLSBAD, N.M. - Carlsbad Caverns remains closed after heavy chemical fumes caused several workers to get sick on Monday.
The park says those fumes came from a solvent used by a contractor to clean newly installed rails in the elevator shaft.
The elevator takes visitors below ground to view cave formations.
Employees reported having bad headaches and other illnesses from the smell.
Right now, it's unclear when the caverns will reopen.
The park is offering refunds for those that have reservations.
The bat flight programs are still scheduled to go on.