A 500-pound man stuck in the St. Croix River in Wisconsin after a tubing accident was rescued Tuesday morning, 12 hours after he fell into the water.

The 39-year-old, whose identity hasn’t been released, was recovering in an area hospital after a nearly 12-hour rescue effort by the Coast Guard and sheriffs.

The man wound up lodged in a rocky, shallow patch of the St. Croix, in Grantsburg, Wis., after his tube apparently deflated during an expedition, according to local TV and newspaper reports.

While he was trying to get out of the water and walk along the shore, he apparently suffered chest pains and a possible heart attack and fell into the river, the local media reported.

The river conditions and the man’s weight complicated the effort to get him out.

Click here for more from The Pioneer Press, a Twin Cities and Wisconsin newspaper.

Click here for more from the local Channel 4 Web site, wcco.com.