Danger Beneath the Sea is a competent enough military suspense-action yarn with lots of naval lingo to appease those who pine for more Tom Clancy novels. Viewers shouldn't hunt for Red October here, but what's onscreen isn't terrible, just unrelentingly macho. Underwater effects are okay, suspense factors are well handled, and the editing swims past plot problems faster than a dolphin in heat. Casper Van Dien, who has one of the best chins in the business, seems always to be smiling, even when his back is against the wall and guns are at his head. It's a little off-putting, but it doesn't seem as if Van Dien is capable of making a different expression without breaking his face.