Two things - one: this film is nowhere near as bad as some say. Of course, that doesn't make it good, but I enjoyed it.
Second - the prop used to show the strength of communications signal when the first scout explores the cave system is in fact a silver Korg guitar tuner! Not worth mentioning usually except that it is shown in close up several times during this sequence, with the row of red lights normally used to show how close to the note the guitar string is representing here the strength of the signal from the first scout diver...
You can freeze the DVD on one of the closeups to see the words "Cents" and "Hz" and the note names E A D G B E written on the tuner. Classic.
Now that's what I call cheap props for an expensive film. Incidentally, the Korg tuners are very good - at tuning guitars.
