Helicopter
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 4.5
Situational Awareness
Other Landed off field
Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
Aircraft X called me near ZZZ1 airport near ZZZ. I radar Identified him and validated his mode C; but I do not recall if he had the ATIS. I cleared him into ZZZ Class B airspace along the route we normally assign. A little while later he said something like; 'Tower we are declaring mayday; we are going down.' I reissued the altimeter and asked what assistance he needed. I got no response and then a little while later he called and reported he was on the ground safely and that they were going to call their maintenance. I tried to get more information from him and ended up getting his location and that the people on board were okay. I got the impression from the pilot that the helicopter was in good enough shape that they may be able to fly it out. I filed this as an accident because I don't know for sure that it won't be classified that way and I don't know what condition the helicopter or the crew are actually in. Immediately after the pilots original call we started scanning to see if we could see him out the window. I made the situation known and we got the crash phone activated and then updated the airport authority fire command that the aircrew said they did not need assistance.
Tower describes a situation where he is talking to a helicopter and in lands off the airport in an emergency situation.