I enjoyed the initial cinematic release of this in SUMMER 1975, and appreciate it all the more now, having discovered some facts of it's production history. Basically, this had an allocated budget of £750,000....a modest amount even in 1974, and remarkable considering the minor miracles the production team conjured up in retrospect.
To put this into perspective, the DINO DE LAURENTIS 'KING KONG' of 18 months later cost a staggering 24, 000,000 dollars in comparison, and there is no way that DINO'S 'KONG' delivered thrill-value per dollar in comparison to what this UK AMICUS production achieved.
DOUG McCLURE and SUSAN PENHALIGON serve as the usual anchors to the splendidly atmospheric, evocative mythical lost plateau-world of CAPRONA, ---brilliantly realized via scenic mountainous matte-paintings, tastefully-lit, lush miniature jungle settings, with ice-bound, craggy terrains an added bonus.
Most of this is highly successfully reproduced by intricately-constructed, character-filled miniature sets, usually filmed in high-speed [read:'slow-motion'] photography to increase the sense of mass.
In this age of over-produced CGI [which once stunned and amazed]the DINOSAUR effects on display here,---- essentially elaborate rod-puppets by ROGER DICKENS, augmented by sections of full-scale mock-ups------belong in a wholly seperate category to the frame-by-frame animated models of the O'BRIEN/HARRYHAUSEN school. Some commentaters detract from the DINO-effects on display here, but I personally find them a welcome and refreshing change, and they interact with actual flames and miniature foilage in a way that other MONSTER effects simply can't---[There are also a couple of shots that appear to reference shots of stricken DINOS from the 1933 KONG].
An actual WW1 U-boat was used in this production, to great effect.
This gem of a monster-flick happily takes rightful place in my monster-MOVIE DVD COLLECTION,alongside the '33 and 2005 KONGS, as well as HARRYHAUSEN'S works.
A WINNER!