I don't know much about voles (I just googled the creature...) but couldn't the creature dig it's way out?
Maybe find someone who is not as fearful of spiders to rescue the vole.
You live in a basement? Wow...

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"...and the calliope crashed to the ground."

Yes, I am a basement-dwelling loser.
But I don't think it can dig out... I think there's concrete under there or something.

Poke it, perhaps? Seriously, try poking it up XD

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...Is a recession a type of parade? -Professor Percival P. Pigface. Blissfully unaware of the world's problems.

Luring it with bread or something edible wrapped around a string, away from the window thingy?

Well just get someone else to do your bidding!
Bassment for you, Attic for ME! mine is better, its bigger and has windows

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Housemuziek maakt jongeren kapot!
Nou, alles kapot
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Andrew The Eevee officially evolved into a Flareon on 04.27.09 c:

The solution to your problem is so obvious, XD
You only have to steal a 5 cents coin and keep it so it wouldn’t help economy by being spent, then the government will eventually realize how much millions of dollars you are making them to lose, so they will throw several atomic bombs to your place, killing the spiders for once and for all!!

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¡ ACTITUD BOLSA!

Dwellers in basements do not mean "losers."
What it DOES mean is if a tornado was coming your way, you are already safe. Me, I'd be dragging stuff out of my bedroom closet so I can hide in it. (only room in house with no exterior walls.)

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"...and the calliope crashed to the ground."

Yes but then everyone would be hanging out in my room.

That... is the smartest thing I've heard all day!