I'll be... This might be a caterpillar. A what? A caterpillar drive. Magneto hydrodynamic...

Skip Tyler: [Looking at photos of Red October which show the doors in the front and back of the sub] I'll be... This might be a caterpillar. Jack Ryan: A what? Skip Tyler: A caterpillar drive. Magneto hydrodynamic propulsion. You follow? Jack Ryan: No. Skip Tyler: It's like... a jet engine for the water. Goes in the front, gets squirted out the back. Only it has no moving parts so it's very, very quiet. Jack Ryan: Like how quiet. Skip Tyler: Doubt our sonar would even pick it up. If it did, it would sound like... whales humping or some kind of seismic anomaly. Anything but a submarine. We messed with this a few years ago. Couldn't make it work. This... this isn't a mockup. Jack Ryan: She was put to sea this morning. Skip Tyler: When I was twelve, I helped my daddy build a bomb shelter in our basement because some fool parked a dozen warheads 90 miles off the coast of Florida. Well, this thing could park a couple of hundred warheads off Washington and New York and no one would know anything about it till it was all over.

This... This could be a caterpillar. - A what? - A caterpillar drive. Magneto-hydrodynamic propulsion. - You follow? - No. It's like a jet engine for the water. Goes in the front, gets squirted out the back. Only it's got no moving parts, so it's very, very quiet. Like how quiet? It's doubtful our sonar would even pick it up. And if it did, it would sound like whales humping or a seismic anomaly. Anything but a submarine. We messed with this a couple of years ago. Couldn't make it work. They really built this? This isn't a mock-up or anything? She put to sea this morning. When I was 12, I helped my daddy build a bomb shelter in our basement because some fool parked a dozen warheads 90 miles off the coast of Florida. This thing could park a couple of hundred warheads off Washington and New York, and no one would know anything about it until it was all over. - Are you all right, Captain? - Yes. It's just to die for something as petty as slipping on tea. You're blaming yourself, Captain. It was an accident. - You'll feel better when we put in. - Put in? To base, Captain. We cannot go on without a political officer. Doctor, this is a combat vessel of the Soviet Navy, and I'm a senior combat officer. We do not cancel operations because of accidents. Seaman, come here. Come here. - Your name? - Cook's Assistant Loginov, sir. Good. I want you and the doctor to witness this. I'm removing the political officer's missile key... Carry on. And I'm keeping it myself. Captain, I think we should report this to Red Fleet Command. I'm afraid that's impossible, Doctor. Our orders are for strict radio silence. Orders, sir. - That's all, Loginov. - Yes, sir. This is most unnerving, Captain.