UNDERGROUND ALIENS - A Story of Hollow Earth: Audiobook
According to The Books Insider's catalog data, the UNDERGROUND ALIENS - A Story of Hollow Earth audiobook runs 0.3 hours unabridged, narrated by Brad Grochowski (about 0.2 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 0.3 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 1 day |
| 1 hour / day | 1 day |
| 2 hours / day | 1 day |
| 1 hour / day at 1.5× | 1 day |
You'll finish in – by –
Part of The Audiobook Finish-Time Calculator: the same instrument for any audiobook we measure.
What our data says
- At 0.3 hours, it is shorter than 87% of the 2,649 Action & Adventure (Kids) audiobooks in our catalog.
More narrated by Brad Grochowski
Brad Grochowski narrates 45 unabridged audiobooks in our catalog, 76 hours in all.
- My Very First Duas From the Holy Quran: A Fun Way to Teach Your Child Duas from The Holy Quran
- Getting to Know & Love the Holy Quran: A Children’s Book Introducing the Holy Quran
- Fun Family Jokes
- Jules, The Red Panda: There is no need to pretend, I will be your friend until the end.
- Snuggles, Kisses & Hugs: Have A Party
About as long, on the Action & Adventure (Kids) shelf
50 Action & Adventure (Kids) audiobooks in our catalog run within 10% of this length. The most popular on the store:
Computed from 409,794 English-language unabridged audiobooks in The Books Insider catalog (store data read November 3, 2026). Lengths are the store's own running times. Methodology.
About this listen
UNDERGROUND ALIENS - A Story of Hollow Earth is an audiobook by April Christine Slocum: a 0.3-hour unabridged recording, read by Brad Grochowski, released January 17, 2022, on the Action & Adventure (Kids) shelf.
The listen at a glance
- Length
- 0.3 hrs
- Narrated by
- Brad Grochowski
- Released
- January 17, 2022
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Action & Adventure (Kids)
- ISBN
- 9781777462277
How to listen to UNDERGROUND ALIENS - A Story of Hollow Earth free
New members at audiobooks.com get three free audiobooks with the trial.
Separately, the store's catalog carries more than 10,000 audiobooks that are always free to stream.
Start listening freeQuestions listeners ask
How long is the UNDERGROUND ALIENS - A Story of Hollow Earth audiobook?
UNDERGROUND ALIENS - A Story of Hollow Earth runs 0.3 hours unabridged. At 1.5× speed that drops to roughly 0.2 hours.
Is the UNDERGROUND ALIENS - A Story of Hollow Earth audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates UNDERGROUND ALIENS - A Story of Hollow Earth?
UNDERGROUND ALIENS - A Story of Hollow Earth is narrated by Brad Grochowski.