RAPID CITY, S.D. (AP) — The National Park Service has closed a South Dakota cave after an elevator stopped working. The Rapid City Journal reports that Wind Cave National Park suspended tours Thursday morning after one of two elevators that drop into the cave won’t move. A technician discovered the elevator had stopped working during a routine morning check. Repair crews were scheduled to arrive at the cave sometime on Thursday. The National Park Service resumed tours of the cave on March 20 after a 20-month hiatus. The tours ended in June 2019 due to another safety problem with the elevators. They were repaired in December 2020 but tours didn’t resume immediately due to COVID-19 protocols.