Foundation and submarine: what they have in common

1. Step 1. Foundation — has part — Pile. A pile foundation.
2. Step 2. Pile — is used in — Pile driver. It drives piles.
3. Step 3. Pile driver — has part — Block and tackle. Lifting the weight.
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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