Hi Jack, is this the information you are referring to that you found:
Big Blue SCUBA Diving Shanghai of China - Photo and Video - The Great wall of china - Underwater Great Wall ?
we're also running trips this year to the dive site:
Big Blue SCUBA Diving Shanghai of China - Big Blue Trip - Dive Underwater Great Wall, Beijing
The trip is marked from Shanghai to Shanghai but no reason why people couldn't meet us in Beijing for it.
Thanks for posting the information, i was just searching today to see how people have been using it, feel free to link to the photos or video or reproduce the text as long as you give credit and a link back.
if you send me an email i'll keep you updated with our up coming expeditions, the last one was a few weeks ago where we re-discovered an ancient underwater city named Lions City in 1000 islands lake, we've done a write up on it and posted some photos, going back armed with the video camera and photo camera's end of may.
next trip is next weekend to some small islands south of shanghai which appear to contain plenty of marine life and nudibranchs (i'll confirm with a photo if true)
Thanks again!
Paul