There are a few things in that story that worry me a tad.
Any trench deeper than 5 feet must be shored up or sloped. Rescue workers said they did not see any evidence of a shoring structure when they arrived.
Being a person that is versed in most types of rescue work, this could
have been prevented by very simple means, in other words, shoring wasn't used and a guy died because of it.
Mainly because the company was too tight to get some shoring!.
The trench in which DeHart died might not have been in compliance with state regulations
Watch out!, there's a News flash.
In all of the trench rescue courses I have been on there has been a general idea that you never get into an area that you will never be able to get out of and we always have bracing to prevent further collapse.
If things were done properly mate, I would never have had to take that Trench Rescue course.
Not meaning to water down your post but, the company in question has a LOT to answer for.