Department of Environmental Conservation rangers are making sure they’re ready for the worst-case scenario when it comes to thin ice.

They took part in flat ice rescue training in Horicon this week.

Rangers used an airboat to get close to the subject while preserving the stability of the ice the subject was holding on to.

Rangers also practiced swimming to the subject to tether a rescue rope and then pulling the subject onto the boat.

MORE: DEC: Ice Fishing