Cathedral rocks is well known as one of the deeper shore diving sites in Rockport. It sits behind the Emerson in between Halibut point and granite pier. There are no bathrooms on site and the parking is on the side of a small road. You can only fit maybe 7 to 10 cars at best. That’s assuming there is no one else there. The entry can be tricky if you’re not careful. There is about a 50 foot stack of large boulders that you need to get your gear down one way or another. At the entry point a giant stride at high tide is the easiest way in. Low tide entries hear are extremely slippery and are avoided by most. The dives topography resembles the surface topography. The boulders drop to 70 to 80 feet relatively quickly.