caisson

1. A (permanent) enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc.

   Senkkasten, Caisson

   кессо́нkessón

2. A structure with similar function that is temporary.

3. A coffer (sunken panel).

   an ornamental sunken panel in a ceiling or dome

4. The gate across the entrance to a drydock.

   батопо́ртbatopórt, плаву́чий затво́рplavúčij zatvór

5. A floating tank that can be submerged, attached to an underwater object and then pumped out to lift the object by buoyancy.

   Near-synonym: pontoon

   понто́нpontón

6. A two-wheeled, horse-drawn military vehicle used to carry ammunition (and a coffin at funerals).

   Near-synonym: limber

   a two-wheeled military vehicle carrying artillery ammunition

7. A large box to hold ammunition.

   заря́дный я́щикzarjádnyj jáščik

   a chest to hold ammunition

8. A chest filled with explosive materials, used like a mine.

regular