Submersion means to cover or fill with water or another liquid.
Submersion can make people think of being underwater, swimming, or being in danger.
Examples:
The submersion of the ship was scary.
I don't want to experience submersion in the ocean.
The submersion of the town was caused by heavy rain.
The submersion of the cake in chocolate made it delicious.
The submersion of the city in water was a disaster.
The submersion of the toy in the bathtub was fun for the child.