| The caissons themselves are socketed into rock located 1.2 or 2.4 m below ground, depending on the location. |
| These floats transported the great floating concrete caissons which formed the sea walls of the Mulberry Harbours. |
| The caissons were huge hollow reinforced concrete blocks that were floated across the channel and then sunk when in position. |
| In 1996 the log shafts had been replaced by concrete caissons, but the mine was essentially dormant. |
| Concrete grade beams spanning between the caissons were used to accommodate external envelope conditions and elevator pits. |
| The buttresses rise from caisson caps, each covering six concrete caissons. |
