I dont honestly know what to say, Cept i honestly hope they'll be alright.
You could try dropping some extra bedding/toilet roll in the middle of the cage and hopefally mummy hamster will drag it to the nest which might help warm them/ soak up the damp without you having to interveen.

Good luck and hope they'll be ok, Chev

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Pets:
2 Russian dwarf hamsters, Kili & Fili