I have always been intrigued by the number of wrecks off Argyll, I bought https://www.scottishshipwrecks.com/argyll-shipwrecks/ when it came out, though now I know the waters, I can appreciate how difficult it was in the past to accurately navigate through a storm in rock strewn waters pre chartplotters.
The freakiest thing I ever saw was on a wildlife trip around the Corryvreckan aboard a rib operated by a company called Seafari.
The tide was running quite hard and at one point we were looking at a step in the surface of the water . Having been brought up to know that the surface of the sea is more or less two dimensional, it was mind blowing to realise that there was so much water trying to move through the area that the sea was quite literally forming a waterfall! Used to see it daily at the Falls of Lora underneath the Connel Bridge but that was caused in part by the rock pinnacles that came up from the bottom and broke the surface at low water. Always a strange experience to be sat in a boat that was stationary but had an indicated speed of 30 knots.