Filling in rat holes with cement

Hi,
Have just discovered damage done by rats outside under a garage. [Have set bait traps and the rats are taking it, and we have de-cluttered the outside area].

Now we have a big hole which goes under the cement foundation of the garage. The hole itself is about 10" deep and three feet wide, and some tunnels dissapear under the garage floor. We are not sure how to fill in the hole beneath the shed - we will get concrete mix to fill in the visible hole on the outside, but is there any way to get the cement to pour under the garage?
We know that there are 2 other exit holes into the field and garden, so there must be a lot of tunnels under there.

Wondering what a builder would do, does anyone know?
''A moment's thinking is an hour in words.'' -Thomas Hood
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