Any pool will float if not installed properly. This also refers to heavy gunite pools. Hydrostatic pressure is what pushes a pool out of the ground. This is when you have water pressure pushing up from underground. This is why swimming pools are designed to be kept full of water at all times. Fiberglass pools are designed and built to be structurally sound and will not pop or float when properly installed and maintained. Unlike vinyl liner pools which can experience issues with floating or buckling due to water pressure, a fiberglass pool's shell is rigid and able to withstand pressure from the water. Additionally, fiberglass pools are installed using a bed of gravel to provide a stable base, which further prevents any movement or shifting. However, in rare cases where there is a problem with the installation or the pool is not properly maintained, there is a possibility that a fiberglass pool may experience structural issues that could cause it to pop or float. Therefore, it's important to have your fiberglass pool installed by a professional and follow the manufacturer's maintenance guidelines to ensure its long-term durability and safety.