On this day, March 23, 2005, the Texas City refinery explosion occurred.

[ProfessorGAC]

1. Read A Lot About This

In particular, I read the whole CSB (Chemical Safety Board) report. And, the Mogford report which was much more CYA than informative.
Many of the people who died did so because they were housed in prefabs, essentially mobile homes.
In the blast, those trailers turned into shrapnel. It has been surmised that at least 3 of those killed had a better chance to survive had they just been standing outside the same distance away.
Very sloppy design & inspection before & during fabrication were main culprits. One pipefitter used an incorrect elbow, which was wholly unsuitable for the application. What was that elbow even doing in the construction inventory for that unit?
The safety culture there was rotten and it cost 15 people there lives.
The money they saved by being sloppy was under 1% of the total cost they paid for this incident. Really stupid business decisions caused a disaster.