What happened
On May 18, 2015, at approximately 12:30 UTC, a mid-air collision occurred between two gliders over a quarry near Unterklien, Austria. The first aircraft, a DG-300 ELAN ACRO, had departed from Hohenems-Dornbirn earlier that day and was performing thermalling maneuvers at an altitude of approximately 940 meters.
The second aircraft, an Antares 18T, had also departed from the same airfield. While the pilot of the DG-300 was executing a left turn toward a slope, they suddenly observed another aircraft appearing below them to the right. The aircraft collided, with the Antares 18T striking the left wing of the DG-300.
Following the impact, the pilot of the DG-300 was able to stabilize the aircraft and perform an emergency landing at Hohenems-Dornbirn without injury. However, the Antares 18T plunged into the quarry below, resulting in one fatality.