some safety concern

I was having dinner with a group of mechanical engineers from the oil and gas industry. One of them shared a very interesting story:

A big oil company deployed an FPSO (floating production storage and offloading) for operation off the coast of this African country. It was shallow water, so by right it would be cheaper to deploy a platform instead of a vessel. But it was out of safety concern that the company opted for the FPSO. What safety concern? When the bullets start flying, the FPSO can just float away. And in fact, they found bullet holes in the hull.

There are things that you can't find in standards or manuals. That's real life engineering.