GALVESTON — The U.S. Coast Guard on Tuesday evening was monitoring an offshore drilling rig more than 100 miles south of Galveston after the rig was hit by a large wave and began taking on water into a ballast tank.

There was no oil onboard the ENSCO 8506 semi-submersible rig, and no reports of injuries or pollution, Petty Officer 3rd Class Manda Emery said.

The rig, which was conducting an exploratory mission and was not actively drilling, has ceased operations, according to the Coast Guard. It has remained stable without the use of emergency pumps or an emergency disconnect.

Crews are at the rig, Emery said.

The Coast Guard deployed a ship from Galveston and an air crew from its station in Corpus Christi to assist at the scene.

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