I won't give away the movie. I only saw the 2D version, and I presume parts of this movie look better in 3D as the really graphic scenes looked awkward.
In the only real caving scene in the movie, the 3 explorers use what appears to be Black Diamond Headlamp. I couldn't tell which version or whether it was LED or not. But in one scene, the silhouette of one of the explorers has a dim blue tinted light. Also, I don't if there are volcanic cave passages like the one they entered to find the 1st deep pit which was something like 300 feet deep. It wasn't a lava tube. And most certainly not like the "mine" passage" that led to another pit which was supposed to between 3,600 and 3,800 ( miles ) deep. It was actually only 8 to 14 miles deep, and probably less as the hit the center at a slow free-fall speed that allowed them to have a cushioned fall. ( And how could the miners in such an active mine filled with diamonds have not fallen into this pit. And how could the previous explorers have travelled this route which was clearly virgin passage. ( There must have been 2 similar nearby routes which is statistically impossible. ) If you can presume that the explorers were really at the real center of the earth, then they would not have to travel but a few feet to go horizontally from Iceland to Germany. So that part makes sense. And they did travel a great distance by sail boat. Finding that sail down there sure was luck. The chances of winning the lottery are higher. I thought the acting was superb, especially the choice of the mountain guide. I did not like the part where the script mixed in the professors' brother's demise. I think there was lots of room for improvement here. I think the concept of the explorers doing such a trip, so ill prepared and coming out unscathed is very stupid. They didn't even have enough gear for a trip to Devil's Sinkhole, much less the center of the earth. Their vertical journey both down and back out, is what really makes this movie so ridiculous. However, I liked the movie for what it was, and thought there were 2 or 3 unique scenes that might be memorable. I recommend you see the BBC TV version of this story, before seeing the movie version. The DVD of that is available at Fry's. The reason being, is you will see how much of this new movie is not so original. The ocean scene where they are all on a hand-woven reed raft is almost identical. The BBC version is a little more believable. The high cost of the new version didn't improve the plot much, but only the graphic images many of which are too far fetched to accept. David Locklear