It's an Ulstein underwater construction ship intended for the offshore petrol industry.  Mainly I'd use it to keep SBX-type radar platforms on station and away from drydock.  Clear enemy barriers to shipping channels and erect offshore structures.  What the others here have said, too.  Oz might use the ship to surveil drilling rigs and suspected underwater emplacements. The US has submarines that can accomplish most of this ship's functions covertly, I'm not sure that it would be all that worthwhile for US service.  Maybe Paul Allen could use one as a tender for his yacht Octopus and its submarines.

v^2