orienteering (control collecting) 1:00:00 
shoes: Inov8 Oroc spikes
This didn't end well...
We hadn't many club members available for control collection so I agreed to drive out and collect 12 in the far SE of the map; Tyson told me the creek crossings should be ok but of course everything was so much wetter than yesterday morning that I didn't dare cross some of the low-lying swampy areas where I could see his wheel marks, and therefore had to walk much more than intended, and then go back for the water casks - it is possible (just) to carry 12 controls at once but maybe I should log it as weight training.
Started hailing just as I got back to the car, and I was a bit worried about the final swampy section 200m from the arena, so intended to veer a little left on to higher ground. Which would have been fine if I'd seen through the hail on the windscreen, that right in front of me the swampy creek dropped into an erosion on my left. Which I worked out when my left front wheel suddenly dropped about 40cm with a disconcerting crunching noise :(
Attempts to reverse out of the channel resulted in detachment of half my front bumper but no backwards motion. Thankfully Tyson and the Ashforth clan were still around and I called them over rather sheepishly, and Tyson rang the ForestrySA ranger while S & H (aged 6 and 4) gleefully said things like "Your car's stuck in the hole!" which I had to acknowledge as being factually correct, if somewhat inconvenient. Anyway, nice Ranger Dan turned up within the hour with a decent sized ute (none of the rest of us had proper 4WDs) and a very strong chain and pulled me backwards out of the hole, no worries mate, and then produced some cable ties to secure the sadly-trailing bumper!
Definitely ashamed of my stupidity, but at least it's still driveable. Hope we don't get in trouble with the rangers for driving across the creek and into the forest? It does seem, reflecting on our history of events here over the past 30 years, that Wirra Wirra is nearly always too wet in Aug/Sept and this causes problems.