The SciFi Channel's 2005 movie "Descent" is a weak to fair reworking of the old "journey to the center of the earth" plot.
The movie appears to suffer from the classic failings of a SciFi Channel made for TV movie. Sets are limited and one gets redundant views of actors at sparse consoles intermixed with low budget animation of the vessel called "the mole." There is some action and some intrigue, but the movie gets a bit redundant with just three main sets (mole, cave, and control room) and the actors who try to twist the uninspired dialog into something entertaining.
Luke Perry does a good job as Dr. Jake Rollins, but Michael Dorn ( aka Warf from Star Trek) appears one dimensional with General Fielding's stilted dialog.
This might seem like another homage to Jules Verne's piece of classic of nineteenth century French literature "Journey to the Center of the Earth;" it is not. For that watch the 1959 classic "Journey to the Center of the Earth" with Pat Boone and James Mason. The "Descent" is another "tunnel digging vessel heading to the center of the earth movie." If you like this sci-fi theme try episode # 1.2 from "The Secret Adventures of Jules Verne" titled "Queen Victoria and the Giant Mole." If you desire the big budget modern special effects, there is 2003's "The Core" with Hilary Swank. These choices may entertain and stimulate your imagination more.
However if you love science fiction, have nothing else to watch, and want to rest your brain; "Descent" will suffice.