Okay...grandpa/Marine/engineer anon here. Without getting too close to doxing myself, I'm an SME on filling in the tunnels on LSJ island. Chances are I know someone involved in actually doing the work. Back somewhere between breads 1800-2400 on Qres, anon posted pics right after the work was done, and filled holes were visible. I may be able to track down the company that did the work, if I can find that set of pics. Tracking the equipment used should be reasonably easy for me, if I can find those pics. This is the busy time of year for me, so weekends are the only available digging time I got. Need help finding those pics. Only the oldfags here since then may remember them. Find them pics, and I'll dig all weekend and hopefully post a decent dig by Sunday night.
Helpful, found some clues, but didn't find the one I'm looking for. It had distinct disturbed areas, and from that I can determine bit width, and then type of drill used. Over 3` diameter and I'll find the drill. That gets me to a company name. It was around the time an AC anon was figuring out the volume from the ac units size. Thanks for tip anon, I only stuck to Qres till yesterday.
Around that time the pic I need comes from. It isn't in the orgy island thread tho. I'm in a digging mood. Everything to fill in tunnels is there except the drill to get them to it. They need that to fill up to the highest level. Mix truck in the shed, small 3" concrete pump, the hdpe tube was most likely for grout transport down or in thru entrance. Cheaper than steel pipe, but need a thermal welder. I really wanna find the pic Cruz I can determine the drill bit size. Ain't but so many Hayne drills in VI, and I know just about everyone that can run it. I will perservere!
persevere! You look at this pic, you can see the tennis court cover is a tent, door at front, poles visible on right side. Court lines painted on top. Most likely did the filling in under that cover. With the small pump visible, took one helluva long time to complete the job based on acanons digs.