Sonobuoy and data centre: what they have in common

1. Step 1. Sonobuoy — has part — Hydrophone. A hydrophone.
2. Step 2. Hydrophone — is part of — Sonar. The receiver.
3. Step 3. Sonar — is part of — Submarine. Underwater acoustics.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
5. Step 5. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
6. Step 6. Uninterruptible power supply — is part of — Data centre. Backup power.

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