Disjointed jungle adventure follows three disparate groups of characters as they search for diamonds in the Amazon and encounter savage natives. Generally boring, but briefly enlivened by some awesomely gory scenes (crabs!),and a half-nude amazon fleshed-out (no pun intended) by Sonia Infante. Location shooting also helps, although some of the cast members look like they would be more comfortable in a nursing home. ** out of 4.

A diverse array of folks that include rugged guide Gringo (Stuart Whitman in top rough'n'tumble form),slippery former Nazi Klaus von Blantz (a deliciously slimy Donald Pleasence),and foxy lady Barbara (the gorgeous Ann Sidney) brave such perils as piranha, alligators, bees, vicious crabs, and the inevitable tribe of savage cannibals while searching the jungle for a fortune in both gold and diamonds. Director Rene Cardona Jr., who also co-wrote the suitably lurid and eventful script with Jacques Wilson, covers all the essential entertainingly low-grade bases in a satisfying and straightforward manner: The brisk pace never falters for a moment, some tasty gratuitous female nudity, plentiful action, a colorful array of shady characters, breathtaking tropical scenery, a tough no-nonsense tone, graphic gore (the sequence with one guy having his eyes torn out by the crabs rates as the definite nasty splatter highlight),and a nicely cynical attitude about man's unpleasant capacity for greed, lust, and treachery. The excellent cast of familiar B-movie veterans keeps this movie humming: Bradford Dillman as hearty and sarcastic airplane pilot Clark, beautiful busty brunette Sonia Infante as the feisty Marimba, John Ireland as a wise priest, Jorge Luke as antsy loser Jairo, Emilio Fernandez as the mean and intimidating Tacho, and Hugo Stiglitz as a riverboat captain. Daniel Lopez's crisp cinematography vividly captures the beauty and danger of the jungle. Mort Garson's robust full-bore score hits the stirring spot. A total sleazy blast.

Thilling and moving film concerning an unstoppable chase to find a valuable treasure , while battling for survival with threes groups besieged by head-cutters Indians , greedy gunrunners , including gore and blood . Exciting adventure and exploitation movie with three groups of adventurers all vying to find a treasure in the jungle where they clash against each other , take off the relentless natives , as well as the perilous wildlife . The best scenes are the immense efforts of the mean groups have to carry out for their purports , forced to do anything and everything they could to stay alive . Their Greed & Lust for Diamonds Was More Deadly Than the Perils of the Jungle. They survived the impossible...by doing the unthinkable. It's "Man against Man" and "Man against Nature" - Which One Will Prove More Deadlly ?

In the film there are noisy adventures , action pace , impressive struggles , beautiful landscapes and lots of blood and gore . An adventure movie relying heavily on sensationalistic aspects , eerie images full of gore , nudism and exploitation , such as physical violence , tortures , merciless natives executing decapitation and many other things . Regarding corrupt and ambitious people who will have to confront lots of risks until find a treasure and all of them will take on villains , savage Jibaro tribes and fighting each other . From start to finish the action-packed is non-stop and gory paranoia reaches a fevered pitch that culminates in a final savage action . The flick features many strong scenes , among them beheading , astonishing slaughter , cannibalism , a gloomy spectacle to watch . It's fast moving and that's why it is neither tiring, not boring , but bemusing . Special effects are passable , but other parts of the movie are never fully realized . The movie pushes too hard and too far , and no apt for squeamish . It strives for being some inspirational but falls well short of being really inspired and marred by some extreme exploitation scenes . In spite of it , the movie is entertaining , though shot in fits and starts and in Mexico obtained success enough . It was shot on location in Chiapas, Mexico and studios : Churubusco Azteca, Mexico City, Distrito Federal, Mexico , and Tuxtla Gutierrez, Chiapas, Mexico . Being a Mexican/American co-production , here appear notorious American actors as Stuart Whitman , Donald Pleasence , Bradford Dillman, John Ireland and Mexicans as Emilio Fernández , Sonia Infante , Pedro Armendáriz Jr. , Jorge Luke , Hugo Stiglitz , all of them giving ordinary performances , but they were so fun and amusing that kept entertainment in the film.

This horrific retelling of the treasure hunt throughout Amazon jungle was regularly written/produced/directed by Rene Cardona Jr who developed a long career as national as international . He was a Mexican director and writer, expert on all kinds of genres with a penchant for Terror , adventure and exploitation ; being especially known for The Treasure of the Amazon (1985) , The Bermudas Triangle (1978) , ¡Tintorera! (1977) , Cycone , Fantastic Balloon Voyage , Under Siege , The Night of a Thousand Cats , Survivors of Andes , Beaks , Carlos the terrorist and Guayana, El Crimen del Siglo (1979) . Rating : 5/10 , average but passable and acceptable.