With grateful thanks to the Black Sheep Diggers, I have have implemented a Deep Zoom version of their superb survey, the Goyden Cave System: https://www.braemoor.co.uk/caving/goyden.shtml
As one surveyor to others, this is an outstanding effort, beautifully and thoughtfully drawn, including the use of a shadow with cutaway for the multi-level area, which shows a real care and attention to detail. Very much like the use of Creative Commons too, and the image demonstrating the relationship to the surface (a lovely inclusion on many modern surveys).
I'd echo Cavematt's comments, an outstanding effort and congratulations to all involved. Surveys like this are great for suggesting things that are worth looking at. I've always been intrigued by the destination (and origin?) of the passage above Telegraph Aven that terminates in Crater Chamber with both routes forward blocked by chokes, presumably on the same fault....but I'll leave that to a younger generation of explorers