Pressure in a fluid rises with depth, which is why a container's bottom supports:

1. Depth and pressure are directly linked in a static fluid. 2. The forces on a submerged body are larger underneath, due to greater depth. 3. A container's bottom supports the weight of the fluid in it. 4. That accumulated weight is what raises the pressure at depth. 5. The same depth dependence produces the buoyant force on a submerged object. _Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 11 'Fluid Statics', sections 11.1-11.9_