Caisson

A caisson can refer to:

caisson (engineering) is a retaining structure used in locations normally under water to keep the working environment dry.
caisson (military) is a carrier of artillery ammunition.
caisson (vehicle) is a carriage used for coffin transport in funerals.
The water-tank wagon used on canal inclined planes and boat lifts
"Caisson", a pen-name of Edward Sperling.