JOHANNESBURG (AP) — Five miners were trapped deep underground at a South African diamond mine after a mudslide flooded a shaft they were working in, mine officials and a labor union said Thursday.

The miners have been trapped since the early hours of Tuesday, according to the Congress of South African Trade Unions — an alliance of labor unions that includes the main mineworkers union. The congress said the miners were thought to be trapped around 800 meters (half a mile) underground.

Ekapa Mining General Manager Howard Marsden, whose company operates the mine, told national broadcaster SABC on Wednesday that rescuers were pumping water out of the shaft while a separate team was trying to drill a hole to where the miners were believed to be trapped to try to establish communication with them “or any proof of life.”

The mine is in the central city of Kimberley, which is renowned for its diamond mines and was at the heart of the global industry after diamonds were discovered in the area in the late 1800s.

The Minerals Council of South Africa said this month in its annual safety report that 41 miners died in mining accidents in South Africa last year, a record low and down from hundreds a year in the 1990s and early 2000s.

South Africa is among the world’s biggest producers of diamonds and gold, and the top producer of platinum.

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