Details of this site are extracted from the "Perkins Point Corridors" site.
... site that local divers call the Valley of Monuments (N 45°12’50", W 071°59’42"). Indeed, on a mud bottom, at a depth of 65 feet, you can see huge chunks of rock detached from the cliff measuring 5 to 10 meters high and lying here and there. This site offers quite a spectacle when the sun’s rays manage to pierce the surface between these monuments.
More details available at Scubarama’s Massawippi page:
in French,
English (Google Translate).