Make that more than half filled with gloop. Oh - and thixotropic, not liquid.
Mark is entirely right; the actual link is Liam's Way.
Brian Hague and I found Colostomy Crawl, after we'd bolted up Egnaro Aven. He shoved me to the front, as it looked a bit "snug". It started off half filled with the most vile mud I've ever seen but it soon got worse. As I moved along it turned thixotropic but then flowed in behind me and started to set. I managed to make it to a point 40 m from Egnaro Aven but Brian couldn't have got to me to help by this stage and I was getting seriously concerned about being able to return. Perhaps the name given to this place now makes more sense?
Mark & friends were extending the Trenches beyond Wind Tunnel a bit later. (This was before Ben Bentham opened the Fawlty Towers bypass to the Wind Tunnel, so digging trips at the end were challengingl Wind Tunnel is one of those places where your head always seems to be 2 or 3 bends in front of your feet.) They reached a point in a horrible low muddy crawl similar to Colostomy but what made them keep going was the sound of the Speedwell river. After some hard pushing they got through and the overland connection we'd dreamed of for years became reality. Mark wrote a superb article about this in the next TSG Journal.
However, my own involvement with Colostomy etc ended before the dry connection, because I was one of those lucky enough to go into Speedwell via Treasury Sump. The next time I went back was donkeys years later when we did the first Titan to Peak through trip. I just didn't recognise Colostomy; all the gloop had vanished and it was now a rocky crawl. I really thought we must have gone wrong somewhere until Moose explained that the passage of cavers over the many years since we found it had effectively cleared it out.
I mention all the above because anyone new to Colostomy Crawl nowadays might not understand why it was so named. So there you go.