Changes in sea weather, especially the strait facing the open sea, will greatly affect inter-island underwater drinking water pipelines, which can cause damage to pipelines made from Height Density Polyetheline (HDPE). Damage that often occurs is broken or folded, so repairs will be difficult given the position of the damaged pipe is at the bottom of the sea, so that special needs to be repaired. Repairing underwater drinking water pipes is done by lifting pipes from the seabed with floats made of plastic drums. After the pipe is lifted from the seabed to the surface of the sea water the pipe will be connected in accordance with the connection procedure and subsequently drowned again by installing ballast. The length of the pipe raised to the surface of the sea is taken at least 1.5 depth of the sea on the damaged pipe making it easier to repair or reconnect. To lift one side of an underwater drinking water pipe type HDPE PN.10 bar with a diameter of 110 mm that breaks at a depth of 42 m requires a float of 13 units to be installed on a ballast concrete 6 m apart.