Greek fire and conveyor belt: what they have in common

1. Step 1. Greek fire — uses — Piston pump. It was projected by a siphon pump.
2. Step 2. Piston pump — is part of — Concrete pump. A piston pump.
3. Step 3. Concrete pump — has part — Hydraulic cylinder. Hydraulics.
4. Step 4. Hydraulic cylinder — is part of — Tunnel boring machine. Hydraulic cylinders push the machine forward.
5. Step 5. Tunnel boring machine — has part — Conveyor belt. Spoil is removed by a conveyor.

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