The architect of a mystery underground tunnel found near the Rexall Centre at York University in Toronto says it was just a fun project for him and some friends. Elton McDonald, a 22-year-old construction worker, has come forward to say he meant no harm by building the bunker discovered near the venue for the upcoming Pan-Am Games. “It was not meant as a bad thing,” McDonald told the Toronto Sun in an interview. The tunnel – 10 metres long, almost two metres high and less than a metre wide – sparked a great deal of speculation after it was discovered Jan. 14 by a Toronto Region and Conservation Authority employee.