Bluetooth Range and number of data points

[vkadal]

I need to collect data from approximately 20000 points. I want to form a BLE mesh network and collect the data. The sensors may be buried below the ground level about 30 to 50 CM deep, and the sensor will be kept in side a concrete / brickwork / rigid PVC / steel chamber. ( The selection of suitable chamber is in our choice) The next data point will be within 5 meters. 

Can your Bluetooth devices work under this condition?

[Daniel Chisholm]

Interesting question.  We need to figure out if the nodes can talk to each other, and if so, can a BLE mesh network can handle the load?

To the first part: Is it fair to say that the bluetooth chip (more importantly, its antenna) has to be with the sensor, in which case this problem statement begins with "can the bluetooth signal of a device buried up to 50cm deep travel up to 5m through the soil?"  Or can the problem be solved by having the antenna closer to the surface, ideally at or above grade level?

[vkadal]

Antenna can be placed at the top of the chamber , in other words, closer to the earth surface. Then it may need travel through 5-10 cm of soil or chamber top wall. Next Bluetooth device will be within 5-7 meters