Now in the olden days we'd evacuate to the outside landing with a handheld radio and a very pistol and keep on trucking until situation sorted. I remember the old control tower under the water tower when the early morning controller went outside for a quick fag and passed the mike out through the door which promptly locked behind leaving him "alone and unafraid!".... simple fix was to ask the incoming Speedbird to call DN Approach and ask them to send the firies up to perform the "rescue" by opening the door from inside. Speedbird was not delayed!!!