Daryl,
Just about every company will/is recruiting you can pick up lists of companies all over the place.
I used to use the IMCA website as there is a list of IMCA registered companies many with website links from it.
The big players in the industry are Fugro-Rovtech, Subsea 7, Oceaneering, Technip, Acergy, Sonsub Off the top of my head
Some of the smaller companies include Hallin Marine, ISS, TS Marine
As you can see there are a lot but if you get your C.V. out there it will get picked up by someone. There are also a couple of recruiting companies who are worth getting in touch with.
Omega resources and Mansell recruiting.
They recruit for some of the companies above.
Realistically though you have to be prepared to wait. You send off a C.V. now you might not get a start until around March as the wheels turn slow in the big offices.
Hope this is a little help to you
Jim