Longitude 123, Inc. (L123) is a California marine project consulting and underwater construction management firm that employs over 100 years of hands on experience to plan, permit and perform energy-related projects in coastal and offshore California, with special emphasis on California underwater construction and marine decommissioning.

Our experience and understanding of the processes required to successfully plan, permit and perform marine and underwater projects in California’s tough regulatory environment has time and again proven to minimize our client’s risk exposure and reduce project costs.