Helicopter
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3.5
Situational Awareness
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution
Aircraft
I took a handoff from ZZZ ARTCC for Aircraft X direct to ZZZ airport at 3;000 [feet].  I noticed Aircraft X descending through 2;500 [feet] before they checked on; so I reached out to pilot.  Aircraft X responded that they were [advising ATC] and need to land now.  I told them about the closest airport but the pilot responded they were landing where they were.  I informed Supervisor and gave them the lat/long and county information.  I also used other aircraft to relay information to and from Aircraft X.  Aircraft X landed safely.  It would be nice if controllers had a button on the radio panel to call 911.  I believe that about 10 minutes went by before 911 was called.
TRACON Controller reported that an aircraft that landed off field.