Diving suit and chisel: what they have in common

1. Step 1. Diving suit — evolved into — Aqualung. Autonomy.
2. Step 2. Aqualung — uses — Compressed air. Cylinders.
3. Step 3. Compressed air — is used in — Rock drill. Pneumatics.
4. Step 4. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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