Sound wave and oil well: what they have in common

1. Step 1. Sound wave — is used in — Echo sounder. A sound pulse.
2. Step 2. Echo sounder — evolved into — Sonar. Echolocation.
3. Step 3. Sonar — is part of — Submarine. Underwater acoustics.
4. Step 4. Submarine — has part — Diesel engine. Diesel-electric submarines.
5. Step 5. Diesel engine — is part of — Drilling rig. The drive.
6. Step 6. Drilling rig — is used in — Oil well. A well is drilled by a rig.

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