Submarine and sewage treatment plant: what they have in common

1. Step 1. Submarine — has part — Periscope. A periscope.
2. Step 2. Periscope — is part of — Tank. Observation devices.
3. Step 3. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
4. Step 4. Gas turbine — has part — Compressor. A compressor.
5. Step 5. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

Open Evothings