This film is a very good entry in the late '50s sci-fi cycle, about a group of explorers and scientists who discover a lost tropical world below sea level in Antarctica (!) Reynolds (the pilot), Mahoney (the scientist), Smith, and Harvey crash-land and encounter dinosaurs and a survivor from an earlier expedition (Brandon). Great (although obviously indoor) sets, literate script, and good acting are the pluses. The dinosaurs are pretty shaky, especially the Tyrannosaurus (a guy walking around inside a dinosaur suit).

Rip Specs (BD Rip)

General           : The Land Unknown.1957.720p.BluRay.AVC-mfcorrea.mkv
Format            : Matroska at 9 529 Kbps
Length            : 5.20 GiB for 1h 18mn 6s 42ms

Video #0          : AVC at 6 500 Kbps
Aspect            : 1280 x 544 (2.353) at 24.000 fps

Audio #0          : DTS at 1 509 Kbps
Infos             : 2 channels, 48.0 KHz
Language          : en

Audio #1          : DTS at 1 509 Kbps
Infos             : 2 channels, 48.0 KHz
Language          : de

Text #0           : VobSub
Language          : en

Text #1           : VobSub
Language          : fr

Text #2           : VobSub
Language          : de

 
http://www.imdb.com/title/tt0050622/

Audio: English or German (dual audio)
Subtitles: English, French, German

My rip of German BluRay