Yes severely undermanned. I talked to a MDV buddy and he said they do not have an exclusive detailer but work with the HM detailers. As diving isn't a skill set everyone can do let alone to work/operate underwater is even harder. Unless you get bottom time there will not be the proficiency to be diving effectively as a DMT on a working basis. I was a civ DMT for a spell and I was a chamber maid.
I recommend that if you want to do HM work and dive then I would go to HM A school then BUD/S. Last I heard although you are a SO by rate you can do HM first and follow the somewhat fluid career path of a SEAL HM. Being a SEAL qualified HM will guareentee you operating and getting the best medical training in the DOD inventory. Also look at PJ. Best of both worlds for HM/DMTs.
Not interested in being a quote on quote HM to be honest, for me it was the 2nd best thing to being a Diver since I can be stationed at Dive Commands, hence I was initially under the impression that DMT's are full time divers who operate the chamber when needed... apparently that's the farthest thing from the truth. I sense being at a Dive Command, I'd likely be a 0000 HM who operates the Chamber and dives strictly for quals and possibly while on deployments. Much more action at a EOD or SDV command as a DMT but I want nothing to do with SO, I got contracts for ND and SO but wait time is 7 months min and I just waited a year to get a waiver approved, I'm ready to ship!! DMT would at least give me insight on ND daily ops...I know time flys once you get in, DMT is 3yrs obliserve, before I know it I'll be eligible to submit a dive packet.