I think you refer to an Artesian well.
The life jacket is filled with material that floats, and has enough buoyancy to keep additional weight afloat.
Surface water refers to lakes, rivers and other bodies of water. It is usually filled with fish and other animals. Groundwater is the water that lies under the ground.
These holes do not get re-drilled as they were never drilled in the first place. they are built and stay built. There is not "drill" to create them. If they get damaged or filled in, the building is in trouble and needs to be re-built, not re-drilled.
Groundwater
A depression on the surface of the Earth created by groundwater is known as a cone of depression.
The two zones of groundwater are the saturated zone and unsaturated zone.The saturated zone is filled with water and is below the unsaturated zone. The unsaturated zone has water and air in its pores (tiny open spaces in the soil).
Cyst
They are both filled with living material.
A cast.
In large tanks that have been filled up by an oil tanker or by pipeline depending on the distance that the oil was drilled from; from shore.
Basalt
A big feather filled couch.