Some will be allocated to the sterilisation drilling on T3.I...

Some will be allocated to the sterilisation drilling on T3.

I  would say the rest have been brought to site for quicker mobilisation as and when required. Also maybe to have one in reserve for the inevitable down time due to breakdowns, repairs, maintenance etc. 

It's a nice contract to have. The drill co won't want to loose it you would imagine.

So I would agree with you that all of them are unlikely to be currently drilling at this moment, unless they were all deployed for the sterilisation drilling as I mentioned earlier.