On June 21, 2023, about 1530 eastern daylight time, a Let L-23 Super Blanik, N10BR, was substantially damaged when it was involved in an accident near Richmond Field Airport (69G), Gregory, Michigan. The flight instructor was seriously injured, and the student pilot received minor injuries. The glider was operated as a Title 14 Code of Federal Regulations Part 91 instructional flight. The glider came to rest about 3,500 ft northwest of the north end of the runway at 69G. The student pilot reported that he was flying the glider until about 10 minutes before the accident when the flight instructor took over control and started looking for thermals to gain altitude. He said the flight instructor was mostly quiet until he said they were going to perform an off-field landing. The glider flew across a tree line about 150 ft above ground level and turned to land in a bean field. The student had no further recollection of the accident. The flight instructor also reported that he had no recollection of the flight. The glider sustained substantial damage to the fuselage and both wings. Postaccident examination showed that the forward fuselage was crushed upward, and rearward and the outboard 6 ft of the left wing was separated. The separation point had signatures indicating upward bending of the tip. The damage to the glider was consistent with a nose-low, left-wing -ow impact. Flight control continuity was verified from the cockpit to all control surfaces. No preimpact anomalies were detected.