This. Construction sites do not keep large steep trenches just lying around. It’s dangerous for workers and can be against safety laws. If a large hole just was randomly found collapsed, there would be some interest in that (Is the area around it safe to continue work? Was any of the work damaged from the collapse? Who is liable for any rework due to the collapse?)
Sides of a trench are usually sloped or there are special shoring devices. Yes accidents are still possible, but there are many mitigating factors that make it unlikely IMO.