Movie

Unknown World

“Drilling into the forbidding depths of the earth!”

★ 4.4(34)19511h 14m

Unknown World is streaming on Amazon Prime Video, Cultpix and Amazon Prime Video with Ads in Australia, and available to rent or buy on Amazon Video. Availability checked 18 June 2026.

Where to watch Unknown World

🇦🇺 Australia

Amazon Prime VideoStream

CultpixStream

Amazon Prime Video with AdsStream

Amazon VideoRent

Amazon VideoBuy

Good to know

Director: Terry O. Morse
Release date: 1951-10-26
Runtime: 1h 14m
Language: English
Status: Released
Country: United States of America
Studio: Lippert Pictures

About Unknown World

Unknown World is a 1951 movie in the Adventure and Science Fiction genres, directed by Terry O. Morse, starring Bruce Kellogg, Otto Waldis and Jim Bannon. It has a runtime of 1 hour 14 minutes. It holds an average rating of 4.4/10 from 34 viewers. Below you can see where to watch Unknown World in Australia — across streaming, rental and purchase options — along with the full cast, trailer and viewer reviews.

Synopsis

With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.

Cast

Bruce Kellogg

Wright Thompson, Jr.

Otto Waldis

Dr. Max A. Bauer

Jim Bannon

Andrew "Andy" Ostergaard

Tom Handley

Dr. James Paxton

Dick Cogan

Dr. George Coleman

George Baxter

Carlisle Foundation Chairman

Marilyn Nash

Dr. Joan Lindsey

Victor Kilian

Dr. Jeremiah Morley (uncredited)

Themes & keywords

caveexplorationscientific expeditiontunnelunderground lakesubterranean worldunderground cavernwoman scientistpoison gas

Frequently asked questions

Where can I watch Unknown World in Australia?+

In Australia, you can stream Unknown World on Amazon Prime Video, Cultpix and Amazon Prime Video with Ads. It's also available to rent or buy on Amazon Video.

Is Unknown World on Netflix?+

Unknown World is not on Netflix in Australia right now, but you can stream it on Amazon Prime Video, Cultpix and Amazon Prime Video with Ads.

How long is Unknown World?+

Unknown World has a runtime of 1 hour 14 minutes (74 minutes).

Who stars in Unknown World?+

Unknown World stars Bruce Kellogg, Otto Waldis, Jim Bannon, Tom Handley and Dick Cogan.

When did Unknown World come out?+

Unknown World is a 1951 movie directed by Terry O. Morse.

What genre is Unknown World?+

Unknown World is Adventure and Science Fiction film.

Who directed Unknown World?+

Unknown World was directed by Terry O. Morse.