Hello we are currently trying to locate a water leak underneath a Shopping center that houses a Private Workout Pool we have dug under the Concrete Foundation and feel we are almost there at the water source leak. My Question is how do we pump concrete into the Tunnel to secure the area we have disturbed with all of the soil we have taken out. This soil is Saturated from years of water from my investigations maybe 18 years of leaks. Any help would be greatly appreciated Thanks

You hire a concrete pumper truck.

Why didn't you use ground penetrating radar?

Like hkstroud said, or rent a mixer and grout pump if you have the man power.

We opted to hand dig under the Center because we lease the space to the workout center, We are 30 feet under the building My crew says now the water smells like shampoo, the Clubs Showers Men and Women's are to our left of our Tunnell. The Workout Center said they had no leaks what started this was water coming up in the Parking lot now we checked yesterday at the club and below there pool Equipment we see water bubbling in the concrete we think this is where the leak is , but now the Shampoo in the water makes me think the shower drains there are about 20 showers men and women. Maybe we are dealing with more than one.

Interesting project. Sounds scary though! I do hope you are adding supports as you progress.