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Zion Marine
Diver in a surface supplied helmet at a dam while the spillway gates discharge.
Commercial diving. Marine construction. One crew.

INFRASTRUCTURE DOESN'T STOP AT THE WATERLINE. NEITHER DO WE.

Commercial diving, underwater inspection, heavy repair and targeted dredging for water, wastewater, dams, bridges, industrial and port facilities. Surface-supplied crews, our own equipment, and documentation an engineer can act on.

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SELECTED CLIENTS
City of Naples
City of Orlando
Collins Engineers
DeKalb County
Domtar
Wharton-Smith
Walsh
VA DGIF
TN Wildlife
Suez
Port Tampa Bay
Phillips & Jordan
PA Fish & Boat Commission
Knoxville Utilities Board
JEA
FDOT
Georgia-Pacific
Haren
HCMS
Gresham Smith
Skanska
Schnabel Engineering
S&ME
AECOM
Eastman
TRIR 0.0 as of 2026·EMR 0.83 as of 2026·ISNetworld / Avetta Registered·ADCI-Certified Divers & Supervisors
Markets We Serve

Find your facility.

Diver in a man basket ready for a dive.

Water & Wastewater

Intakes, clearwells, wet wells and basins inspected and repaired while the plant stays in service. Potable and contaminated-water diving.

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Crew with tools at a spillway stair apron.

Dams & Water Control

Gates, outlets, trash racks and intakes that can't be reached from the surface. Differential pressure checked before every dive.

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Commercial diver working at a pier form on a bridge substructure.

Transportation & Bridges

Pier, footing and abutment inspection, scour assessment, and timber or concrete encasement for DOTs and bridge owners.

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Diver putting on a helmet at a dam walkway.

Industrial Infrastructure

Cooling and process water intakes, basins and outfalls at power plants, paper mills and chemical facilities, worked around operations.

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Diver and crew preparing to dive at a Port Tampa Bay berth.

Marine & Port Infrastructure

Berths, sheet pile, dolphins and waterfront structures. Inspection, repair, dredging and cathodic protection.

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Gate valve lowered into a concrete vault.

Government & Federal

Federal, state and municipal work to the documentation and safety standards public procurement requires. SAM.gov registered.

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Dive spread and crew on a work barge.
The Waterline

Infrastructure doesn't stop at the waterline. Neither do we.

The part of a facility above the water is only half the system. Intakes, gates, trash racks, submerged concrete and pilings continue below the surface, where owners can't see them and conditions go unchecked for years. Zion Marine works across both, inspecting and repairing the components that keep critical infrastructure running.

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Core Capabilities

Technical Services Above and Below the Surface.

One crew inspects, repairs and dredges. Inspect and repair in one mobilization where conditions allow. No subcontracted diving.

Inspection & Documentation

Underwater condition assessment, video documentation and measurement for infrastructure that cannot be adequately evaluated from the surface, delivered as a record owners and engineers can act on.

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Underwater Construction & Repair

Underwater welding, tremie concrete placement, pile encasement, epoxy grouting and structural repair, so an inspection finding does not end at a report when the condition calls for corrective work.

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Water & Wastewater Diving

Potable and contaminated-water diving performed on active treatment, distribution and collection infrastructure, without requiring the facility to shut down when possible.

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Gates, Intakes & Flow Control

Sluice gate repair, seal replacement, trash rack cleaning, stoplog placement and differential pressure safety, for the gates and intakes that control flow through water, dam and industrial infrastructure.

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Dredging & Sediment Removal

Diver-guided hydraulic suction dredging for intakes, forebays, pump wells, basins and berths, sediment and debris removal that restores capacity without taking the facility offline.

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Confined & Difficult Access

Penetration diving in dark conduits, siphons, pipelines and limited-clearance structures, the confined and difficult-access work that keeps infrastructure owners from draining, demolishing or guessing.

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Consultative Approach

START WITH THE CONDITION.

Facility owners do not always know whether a submerged issue requires routine cleaning, targeted suction dredging, gate seal replacement, or a major structural rebuild. We enter projects at the evaluation phase, inspect the actual submerged environment, and help determine the most practical path forward.

Tell Us About Your Facility & Condition
Project Library

Field experience on critical assets.

Work done, not promised. A selection of completed U.S. projects. References available on request.

Barge dive spread with chamber and crew.
Water

Lake Tuscaloosa Water Intake Upgrade

Owner: City of Tuscaloosa · GC: Haren Construction · Tuscaloosa, Alabama · 2024

Removed the existing timber intake and rock ballast and installed a new intake with diver-placed steel formwork, rebar and concrete. Replaced the screen guide rails and the air-valve intake. Surface-supplied air was run from a barge at 110 ft depth with surface oxygen decompression, an on-site chamber, a chamber operator and a dive medical technician on standby.

WaterDeep DivingConstruction
Crew working at a chlorine contact chamber at the R.M. Clayton water plant.
Dams

R.M. Clayton Water Plant Improvements

Owner: City of Atlanta · Levee: U.S. Army Corps of Engineers · GC: Astra Group · Atlanta, Georgia · 2025–2026

Two scopes at the City of Atlanta's R.M. Clayton water plant. At the levee outlets, underwater installation of four custom backflow prevention devices: a 9 ft hinged valve, a 48 in duckbill check valve, a fabricated sliding gate and an 8 x 7 ft hinged valve, with fabrication support, rigging and diver installation. At the plant, chlorine contact chamber modifications.

DamsGates & Flow ControlFederal
Crew on the pier at Berth 214, Port Tampa Bay.
Ports

Berth 214 Wharf Cathodic Protection

Owner: Port Tampa Bay · GC: Russell Marine · Port Tampa Bay, Tampa, Florida · 2025–2026

Underwater installation of 294 sacrificial anodes (194 lb each) on the steel wharf substructure per the plans and specifications. Surface-supplied air with underwater welding and cutting, and a cathodic protection specialist on site for installation, monitoring and commissioning.

PortsCathodic ProtectionWelding
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Where We Work

Seventeen states. One standard.

Licensed in five states. Projects completed in seventeen, from Washington to Florida. Crews mobilize from Tennessee and Florida.

Map of the United States showing the 17 states where Zion Marine has worked or holds a contractor license
LIGHT GREEN: OFFICE · GREEN: PROJECTS OR LICENSE · DARK: AVAILABLE BY MOBILIZATION
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Headquartered in Kingsport, TN. Florida office in Brooksville. Central America operations from San Salvador.

Why Zion Marine

Why infrastructure owners call us.

Hard access

100 ft with a chamber on deck at Lake Tuscaloosa. Sealed suits inside a running JEA plant. Outlet works at R.M. Clayton.

Construction Capability

We move directly from inspection into heavy underwater repair, welding, concrete formwork, and mechanical servicing.

Field Documentation

Clear photo and video reporting, ultrasonic thickness measurements, and field documentation prepared for owner and engineer review.

Field Knowledge

Technical Resources for Facility Owners & Engineers.

Practical guides and technical considerations for planning commercial diving and underwater maintenance operations.

Crew on a float at a dam intake tower.
Underwater Inspection

Planning an Underwater Infrastructure Inspection

What to gather before scoping a dive inspection at a treatment facility, dam or bridge.

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Diver entering a manhole at an operating facility.
Project Planning

Diving Without Shutting Down a Facility

How inspection and repair can be planned around live, operating infrastructure.

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Diver in sealed gear in a wastewater tank with a decon tender.
Commercial Diving

Contaminated-Water Diving: What's Actually Required

Equipment, planning and protocol differences for wastewater and process-water diving.

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Crane barge working on a lake.
Direct Business Development

TELL US ABOUT THE FACILITY AND THE CONDITION.

Whether you require routine underwater inspection, intake clearing, gate repair, or immediate emergency support, Zion Marine will help determine the appropriate next step.

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