Industry Studies on Construction or Engineering

Hello all,

I am trying to do an industry study for a smaller sub-sector of construction or engineering. Specifically, I am looking at marine construction and underwater engineering businesses, as I have some experience in both engineering and diving. I can find a lot of studies for heavy construction and engineering, but narrowing it down from there is a little more troublesome (I don't think the overall industry is representative of the water sector). I was thinking of just compiling a list of all the companies in the area I am looking in and using the average from their data. Was wondering if anyone has run into a similar issue before and how you went about compiling the data?

Thank you in advance,
Matt