Center Controller reported they were instructed by a Supervisor to descend a military aircraft conducting a special operation to an altitude below the minimum IFR altitude. The aircraft entered adjacent facilities airspace without a point out and came into conflict with an air carrier.
Synopsis
Center Controller reported they were instructed by a Supervisor to descend a military aircraft conducting a special operation to an altitude below the minimum IFR altitude. The aircraft entered adjacent facilities airspace without a point out and came into conflict with an air carrier.
Narrative
Working the TFR; the aircraft were two Aircraft X's. Monitoring Supervisor received a call to have Aircraft X fly heading 005 and descend to nine thousand ft. I gave that clearance to Aircraft X. Told the Supervisor that the altitude was below the MIA. Supervisor amended the altitude to twelve thousand which was also below the current MIA but I knew that altitude would be fine further North so I did not stop Aircraft X higher. Apparently nobody from ZZZ Approach was monitoring the situation; and I was supposed to point the Aircraft X out to ZZZ1 Approach and ZZZ which I did not. Turns out the Aircraft X tracked the wrong target and got too close to Aircraft Y. I do not know what altitude the incident happened; where it exactly happened or what target the Aircraft X was supposed to be tracking. This entire thing was an circus that started the day previous with Person A dropping off a handful papers (briefings) that were briefly discussed with the Controller in Charge (CIC) at the time. Each CIC after that glanced through those 'briefings' and the area discussed and tried to 'decipher' what they said; what our actual responsibilities are and what to expect. When I arrived in the area at XA:30 the mid shift informed us that the mid shift Supervisor instructed us to open sector X by itself first thing in the morning. Well; that did not make any sense as all the days 'special use airspace' was in sector Y. By that logic y would have had all the 'special' operations and all high sectors in the area while sector X sat and worked in some arrivals. The opening Supervisor had little to no information about what was going on and was as confused or more than we were in the area; they did try to help as much as they could. When the aircraft arrived Aircraft X; the mid shift cleared them to operate within the confines of their 'next 4 lat/long points as they did not know what else to call it or how else to clear them to do whatever it was they wanted to do. As I got to the area the aircraft arrived to hold in the 'ZZZZZ track' which we could not really understand on the radio and did not know what that was. We eventually found it in one of the briefing sheets.
Second reporter narrative
My trainee and I had just received the sector from the previous Controller. The previous Controller was working Aircraft X that was taking instructions through ZZZZZ1. My understanding when taking the sector was that the previous Controller via ZZZZZ1 had coordinated everything since the aircraft was well inside of Approach airspace (approximately 15-20 miles). The Person A was asking what frequency Approach used and I assumed that they were coordinating with ZZZZZ1 that we were going to be placing the aircraft on Approach since they were headed for a large group of limited data blocks and a track that I saw they tagged up Track of Interest (TOI). I switched Aircraft X to Approach as my trainee updated the flight plan and handed the aircraft off. This all occurred within a minute of taking the sector. Later on I was informed that there had been a loss between Aircraft X and Aircraft Y. When there will be complex operations such as this; brief the Controllers verbally. The TFR was at a special location and we had moving TFR's; a TFR for aircraft; an Organization with multiple sets of aircraft in and out; a refueling track with multiple tankers in and out. The aircraft would move between the Organization aircraft and the refueling track. The only briefing; if you called it one; was a bunch of papers that had some drawings and the textual TFRs. All of these operations were in conflict with all four of ZZZ South departures which climbed to 23000 ft. All facilities that could potentially be affected by a TFR violator should be on the ZZZZZ1 call. If someone was to violate the TFR; it would more than likely have been in ZZZ1 or ZZZ airspace and it was my understanding after the event that neither were on. If the event is preplanned and they know they will be using ZZZZZ1; brief them on the airspace and terrain. I believe they led the previous Controller down the path by instructing them to issue the aircraft an altitude 9000 ft. and a northerly heading. The MIA for that area was 16000 ft. and that put the aircraft in ZZZ1 and ZZZ airspace. If I remember right; the ZZZZZ1 training we receive is in the middle of our sectors; not through multiple facilities. Maybe update the training to a more complex situation such as this.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.