Yup
The sort of assets they're using are by definition rare and spread out all over the place, as they're normally being used for very specialist and differing jobs, an ROV that is good at looking for stuff is normally going to be used for something like searching for ship wrecks, inspecting cables or doing marine research, whilst one that is good at heavy lifting might normally be used to try and salvage something from a shipwreck that's been found or around something like an oil rig.
It's a bit of a miracle they're managing to get the various bits there in the time frame they are given IIRC the maximum speed of many of the ships is around 400-500 miles a day once they can get start moving (which may take hours/a day if they were already deployed and active), and how far apart they likely were doing their normal, planned jobs. It's also worth remembering that some of the ROV's etc they're pulling in may well have been being used on very expensive projects so there could also have been delays as the owners/people they were contracted to agreed to their use given it might end up costing companies many millions of pounds or mean an end to a research project that has been years in the planning (I suspect any such delay would be minimum given the general attitude to sea rescues of "everyone should assist if they can").