( CNN ) A big hole in the ground discovered near a venue for the 2015 Pan American Games in Toronto has stumped authorities looking into it . The mysterious tunnel measured more than 6 feet in height , nearly 3 feet in width and about 33 feet in length , Toronto Police Deputy Chief Mark Saunders told reporters Tuesday . Plywood walls were reinforced with wooden supports . The tunnel was 10 feet underground , with a ladder leading down to the chamber . A rosary with a Remembrance Day poppy hung from a nail on the wall . Remembrance Day honors Canadian veterans who died in combat . `` What does that tell you ? '' a reporter asked the deputy chief . `` That tells me that this was nailed inside the tunnel on the wall , '' Saunders deadpanned as the room erupted with laughter . Nothing so far suggests criminal activity or terrorist intent , Saunders said . `` I was n't overly concerned that 'Oh my goodness this is going to be something horrific , ' `` said Saunders , a 31-year veteran overseeing security of the world 's third largest international multi-sport games . `` We 've got steps and measures in place '' to deal with these kinds of threats , said Saunders . `` If someone is going to be nefarious in this type of way , we 'll be on top of it . '' The discovery of the tunnel -- which was made by a conservation officer last month , but disclosed Tuesday -- comes amid heightened concerns about terrorism in Canada and beyond . In October , a soldier was shot and killed as he stood guard at Canada 's National War Memorial in Ottawa . Officials said the gunman had connections to jihadists who shared a radical Islamist ideology . Two days before the Ottawa attack , another Canadian soldier in Quebec was run over and killed by man whom the Royal Canadian Mounted Police described as `` radicalized . '' Saunders said the tunnel found about 82 feet west of a fence that separated a densely wooded area from tennis courts at Rexall Centre , a tennis and entertainment complex on the grounds of York University . `` There is nothing right now that suggest that this is criminal , '' he said . `` We 're trying to find and establish right now who built it , why they built it and what were their intentions . '' `` There is no criminal offense for digging a hole . '' Authorities are seeking information from the public about any suspicious activity in the area . The tunnel was equipped with electricity supplied by a generator , a sump pump to remove water and a pulley system to remove dirt , Saunders said . It likely took more than one person to dig it out by hand . Ice that formed at the end of a hose attached to the sump pump indicates that the tunnel may have been used this winter . `` This was built with a considerable amount of sophistication , '' Saunders said . `` The individuals responsible for building it clearly had some expertise in structural integrity . '' Police also found a gas can , food and beverage containers , work gloves , a wheel barrow and moisture-resistant light bulbs in the tunnel , which has been filled in . Its entrance was concealed by dirt over a wood lid . `` We do n't know whether someone is building one somewhere else , '' Saunders said . `` I 'm open to anything right now . '' The Pan American Games , which take place from July 10 to July 26 , involve nearly 7,000 athletes from Latin America , South America , the Caribbean and North America . It is the third largest international sports competition after the Olympic Summer Games and the Asian Games . CNN 's Chuck Johnston contributed to this story .
An elaborate tunnel was discovered near Pan Am Games venue in Toronto . Nothing so far suggests criminal activity or terrorist intent , police say . Score: 7