To reproduce:

1. Download attached project and open it;
2. Choose scene 01_Doolittle;
3. Enter Play mode;
4. Unity will freeze and crash in 10 seconds;

Expected result: Triggered gameObjects are destroyed and game doesn't crash.

Actual result: Game crashes before triggered gameObjects are destroyed.

Reproduced in : 5.5.0f3; 5.6.0b3; 5.5.0p4;

Not reproduced in: 5.6.0a1;
.
Workaround: In ShredderBoundingBox inspector window uncheck "Is Trigger", enter play mode and game doesn't crash. Also if you delete one of Destroy(col.gameObject); and in the another one delete col. game doesn't crash as well.