to submerge / to immerse / to sink / to keep down / to lower / to drop / deep / profound / heavy
沉
=
冗
+
氵
:
Charlie Chaplin is experimenting with superfluous liquid helium and a bottle of water just inside the encampment's kitchen. He lets the water flow into the liquid helium, and because the water is frozen instantly, it sinks and submerges.
闷
=
心
+
门
:
Mahatma Gandhi (m) lost his heart (心) when he accidentally dropped it through a trap door (门) in the floor of the encampment ((e)n4). As soon as the heart fell through, the door closed very tightly (闷) which makes Mahatma Gandhi quite depressed (闷).