MEXICO CITY (AP) — Rescue divers’ first attempts to reach 10 miners trapped inside a flooded coal mine since last week were stopped by debris-filled shafts and poor visibility, Mexican authorities said Thursday.

They made four attempts Wednesday and managed to remove more than a dozen pieces of wood and some 15 yards of hose, but were not able to go far.

“They found they didn’t have space to advance,” said Defense Secretary Luis Cresencio Sandoval. “With the lights they carry they don’t have the visibility they need to identify what they find.”

On August 3, 15 miners were inside the coal mine in Sabinas, Coahuila about 70 miles southwest of Eagle Pass, Texas. Authorities believe the miners breached a wall containing another flooded area. Five miners managed to escape with injuries, but there has been no contact with the remaining 10.

For much of the past week authorities have used dozens of pumps to try to lower the water level inside the flooded mine shafts. Wednesday’s dives were the first attempt to enter the mine.

Coahuila Governor Miguel Riquelme said via Twitter Wednesday that pumping would resume before more attempts were made to enter.

In June and July of 2021, cave-ins at two Coahuila mines claimed the lives of nine miners.

Mexico’s worst mining accident also occurred in Coahuila on February 19, 2006, when an explosion ripped through the Pasta de Conchos mine while 73 miners were inside. Eight were rescued with injuries including serious burns. The rest died and only two of their bodies were recovered.

López Obrador’s administration promised two years ago to recover the remaining 63 bodies, a highly technical endeavor that has still not begun.