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In Tom Clancy's novel The Hunt for Red October and the movie based on it, the caterpillar drive (Magneto-Hydrodynamic Propulsion) is a form of submarine propulsion that is much quieter than conventional propellers, using magnetic coils to accelerate water down a tube resulting in a jet-like method of propulsion with no moving parts. However, it is still detectable by skilled sonar technicians, if they pay close attention to the unique pattern of sound emanating from it periodically.

Soundex: C361 ( C361 D61 )

Metaphone: KTRPLRTRF