A high-altitude boundless swimming pool plan typically refers to a design for a swimming pool that extends to the edge of a building or a structure, creating the illusion of having no boundaries. This kind of pool is often found in luxury hotels or high-end residential buildings. The design considerations include safety measures for high altitudes, such as ensuring the pool is at a safe elevation and providing adequate oxygen supply. Additionally, structural engineering must account for the increased pressure and potential freezing issues at higher altitudes.