[MHGinTN]

Clark originally had the event happening on Saturn. In Arthur’s story, Dave ‘fell’ into Iapetus, which orbits Saturn. Iapetus is the moon with a ‘seam’ of three ridges running completely around the circumference of the object.

[Night Hides Not]

You're definitely my "go-to" guy on Arthur Clark novels. I'm only good for recalling bit pieces from the two movies.

I'll be looking for 2001 & 2010 on Blu-Ray, now that we have a new TV.

[MHGinTN]

There was a sci fi story in the fifties which had an ‘astronaut’ finding a huge face on Mars and climbing it he fell into the right eye socket. In the twenties, Tesla and friends received signals from Mars and even had a primitive printer hooked up to a radio telescope which rendered dot-matrix imagery and sequences.

[ArtDodger]

‘Clark originally had the event happening on Saturn’
Actually, Clarke's original story ‘The Sentinel’ took place on Earth's moon. Just a 5 page story but what a wallop at the end.