A ______ caisson is open at top and closed at bottom

a-caisson-is-open-at-top-and-closed-at-bottom-a-wells

A ______ caisson is open at top and closed at bottom.
A. Wells
B. Pneumatic caissons
C. Cylinders
D. Box caissons
Right choice is D. Box caissons

Box Caisson is merely a variation of the Suspended type cofferdam. The box caissons may be built of reinforced concrete, steel or timber. Condition for box caisson is that the depth of water is about 6 meters to 8 meters.