Michael,
Cathedral is a nice dive and among the nicest sites on Cape Ann due to parking availability, deep depths and nice underwater topography -- but there are definitely some things to watch out for.
First -- getting to the site. You need to climb about 100 yards down a pile of jumbled boulders to get to the water. Some gear up and make the hike with full kit on; others lug gear down to the water's edge. When diving this site for the first time, I would definitely recommend going with someone who's been there before. There is one spot where almost everyone enters/exits the water...you need a guide to identify it.
Depths -- depths of 80-85 are reachable from shore at high tide.
Entry/Exit -- there is no beach -- you enter right from the rocks. High tide is best, since you deal with fewer slippery rocks.
Favorable conditions -- any surf at all and you should avoid the site....otherwise you risk being smashed against the rocks upon entry/exit. Exposure is easterly, so east wind usually totally rules this site out.
Underwater -- there can be currents (mainly long shore currents), although in the 10-15 dives I've made there I can't say I've experienced currents that I would call strong. One thing you definitely need to watch out for are the lobster traps (lots of them) -- you will encounter many horizontal lines underwater (usually about 10-15 feet off the bottom-hard to see in limited vis) that connect the trap "strings" together. This makes towing a flag challenging....at the same time there are often lobster boats in the area, no bringing no flag at all can be risky.
Bottom line -- great site, but pays to have a "guide" your first time there.
Hope this helps.
-Chris
michaelp68:
I'm just curious about Cathedral Rocks diving in Cape Ann.
I've heard some people refer to it as one of the better beach dives around, and I've also read and heard that it can be a dangerous dive due to a tough exit on the rocks and a possible strong current.
Just looking for information and thoughts. Thanks.
Michael