Hydrophone and oil well: what they have in common

1. Step 1. Hydrophone — is part of — Sonar. The receiver.
2. Step 2. Sonar — is part of — Submarine. Underwater acoustics.
3. Step 3. Submarine — has part — Diesel engine. Diesel-electric submarines.
4. Step 4. Diesel engine — is part of — Drilling rig. The drive.
5. Step 5. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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