Get a load a this!(slant 6 with a hole)

In the 90's I worked for a chebby dealer and we had Geo, the guy next to me had a Geo Metro with a motor problem and he replaced the short block. The customer was pissed and wanted a long block but Geo wouldn't do it. A week later it came back with a coolant leak and they gave it to me, I said leave it for the guy that put in the motor it's a come back. He wasn't there so I got it, I went out and opened the hood and there was a big hole in the block, piston and rod MIA. Coolant leak and oil leak. I refused to fix it and when he came back the next day he got it to fix, customer got his wish, a new long block. I wonder what it took to blow it apart.