PCCI has served as prime contractor on multiple Magnetic Silencing Facility (MSF) installation and upgrade projects across the country, delivering complex underwater sensor systems in some of the most challenging marine environments in the fleet.

Each project demands a unique combination of precision marine construction, non-magnetic materials, and rigorous quality control — all performed by divers working in active ship channels, often under compressed schedules and alongside the operational demands of major naval installations.

Naval Base Guam – UEMMS Installation
PCCI installed a new Underwater Electromagnetic Measurement System range in the navigation channel at Naval Base Guam, performing subsea and shoreline excavation, sensor placement, and cable laying in an area with active unexploded ordnance hazards from World War II-era battles. The team implemented strict UXO safety protocols while simultaneously coordinating wildlife monitoring to protect endangered marine species in the work zone.

Naval Station Norfolk – EMT Sensor Array Replacement
PCCI replaced a full electromagnetic triaxial sensor array at Norfolk, removing 13 EMT sensors, 7 MT sensors, and 13 legacy concrete protective cylinders before installing upgraded EMT sensors and a new CDT sensor. Existing cabling was recovered, inspected, and selectively reused. Where decades of sediment settlement had displaced ACB matting along the cable run, PCCI devised an on-the-spot solution — repurposing cut sections of the removed concrete cylinders as clump weights to secure the newly installed cabling to the seabed.

Naval Station Norfolk – Type 6 Range Repairs
Working within an 800-foot by 40-foot array located in the Entrance Reach Channel west of the Hampton Roads Bridge Tunnel — in water depths ranging from 40 to 60 feet — PCCI removed damaged EMT sensors and associated cabling and installed new sensors, magnetometer instruments, and over 2,100 feet of replacement cable running to the data concentrator shed. The work included placement of 3,000 cubic yards of non-magnetic gravel over the array, followed by installation of articulated concrete matting across the full cable run.

Naval Base San Diego – AIMS Caisson Construction and Installation
PCCI designed, constructed, transported, and installed a precast concrete caisson over existing FRP piles on the seafloor off San Diego. Built from low magnetic permeability concrete with fiberglass reinforcing, the caisson was set on a non-magnetic stone leveling base, grouted in place, filled with non-magnetic gravel, and capped. PCCI then installed fiberglass cable raceways, a government-furnished junction box, and the full sensor suite before supporting the Navy’s system validation testing.

Naval Base San Diego – AIMS Refurbishment
When settlement along the southern caisson of the San Diego array required structural repair and sensor upgrades, PCCI conducted a pre-construction survey documenting existing conditions and capturing sonar scans of internal voids and scour beneath the structure. Divers removed all existing magnetometers, hydrophones, and the junction box sled before forming the scour areas and grouting both beneath the structure and into internal voids. A newly constructed junction box sled was then installed with upgraded sensors, and PCCI supported full system verification.

Naval Base San Diego – Type VI Sensor Upgrades (Phases 1 & 2)
Across two phases of Type VI system upgrades at Point Loma, PCCI removed 50 legacy sensors, anchor deflectors, and all existing cabling along the array, replaced ten home run cables from the junction box platform to the range house, and installed a full complement of new sensors — including 13 EMT sensors, 18 deep magnetometers, 14 medium-depth magnetometers, and 2 CDT sensors. Phase 2 was executed under around-the-clock operations to meet a compressed delivery schedule, and was completed with zero injuries.