Rope sheath and submarine: what they have in common

1. Step 1. Rope sheath — is part of — Climbing rope. It protects the core from abrasion.
2. Step 2. Climbing rope — evolved from — Rope. A rope.
3. Step 3. Rope — is part of — Block and tackle. The rope runs around the pulleys.
4. Step 4. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
5. Step 5. Drilling rig — has part — Diesel engine. The drive.
6. Step 6. Diesel engine — is part of — Submarine. Diesel-electric submarines.

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