Our Services
Underwater work for every kind of waterfront
From floating homes on Lake Union to commercial barges in Elliott Bay and pleasure craft across Puget Sound — Kandoll Diving Service has 26+ years of safe, certified experience above and below the waterline.
Pleasure Craft
Sailboats, motor yachts, trawlers, tenders & small craft
Keep your boat clean, efficient, and ready to run. From routine zincs and hull cleaning to emergency recovery, our divers take great care of pleasure vessels of every size — including tenders, dinghies, and personal watercraft.
Inspections
Buying or selling? Pre-purchase and condition inspections with still photos, full-color underwater video, and written reports with custom diagrams.
Prop & Buoy Replacement
Setting a new mooring buoy or repairing/replacing a propeller — our divers handle the work cleanly and on schedule.
24/7 Emergency Services
Line or debris caught in your prop or rudder? Need a tug fast? Our 24-hour dive team can be on the way.
Salvage & Retrieval
Sinking or already on-bottom — we'll bring it up. Dropped keys, glasses, a propeller, a wedding ring, or anything valuable? Call right away; time matters.
Anode (Zinc) Replacement
Regular zinc service preserves hull integrity. We replace anodes on shafts, props, thrusters, keels, rudders, and custom mounts.
Hull Cleaning
Routine hull cleaning improves speed, reduces fuel consumption, and protects your bottom paint between haul-outs.
Tenders & Small Craft
Tenders, dinghies, RIBs, and personal watercraft — bottom cleaning, zincs, prop clearing, outboard lower-unit checks, and recovery of sunken or swamped tenders.
Residential & Floating Homes
Floating homes, boathouses, docks & private piers
We keep Seattle's floating homes, boathouses, and waterfront structures safe, level, and built to last — above and below the waterline.
Moorage Systems
Custom-engineered moorage to keep your floating home or boathouse safe and secure — stainless steel brackets, painted HDG steel brackets, camel-log and chain assemblies, and wire-cable systems sized to your site.
Flotation
Floating homes, docks, and boathouses lose buoyancy over time, submerging structural members and pulling decks out of level. We assess your float, remove outdated flotation, and install the right modern replacements.
Deck, Dock & Stringer Repair
Whether your dock needs a full update or your deck has a few soft spots, our crew delivers careful, code-aware craftsmanship on every repair and rebuild.
Pile & Wharf Repair
A rotting or derelict load-bearing pile is a serious hazard. We repair piles and wharves using a range of methods — contact us to walk through the right approach for your structure.
Inspections
Buying or selling a floating home, vessel, boathouse, or house over piles? We provide still photos, full-color underwater video, and written reports with custom diagrams.
24/7 Emergency Services
Sinking, leaking, spraying, drifting away, or dropped overboard — call anytime. We respond fast to limit damage and get things back under control.
Custom Marine Fabrication
Certified underwater (and topside) welders fabricating pile hoops, dolphin piers, sump tanks, and one-off assemblies built for the marine environment.
Gangways, Handrails & Access
Custom-built gangways, rails, ramps, steps, and ladders so your home or vessel is safe for family, guests, and pets.
Sewer, Pump & Water System Repair
Diagnosis and repair of float-mounted sewer, pump, and freshwater systems — keeping the essentials running reliably.
Boat Lift Service
Underwater boat-lift installation, removal, and ongoing maintenance.
Milfoil Retainment Carpets
Installation of underwater milfoil retainment carpets to control invasive aquatic growth around your float.
Commercial Vessels
Ships, barges, ferries & tugs — in port and underway
Dependable underwater support for vessel operators, charterers, and fleet managers — from scheduled husbandry to urgent in-water repairs. Based in Seattle and available to travel worldwide for commercial vessel work.
Ship's Husbandry & Dry-Docking
Sea chest and hull penetration blanking, transducer installation and service, propeller removal/installation/un-fouling, hull and running-gear cleaning, underwater painting, and routine dry-dock support.
Inspections & NDT
In-water inspection services for vessels, barges, and tugs. Non-destructive testing (NDT) and thickness readings on steel and aluminum hulls, delivered with photos, video, and written reports with custom diagrams.
Damage Inspections & On/Off-Hire Surveys
Independent damage inspections plus on-hire and off-hire surveys documenting vessel and barge condition at charter transitions.
Propeller Polishing & Anode Installation
Propeller polishing for fuel-efficient performance and sacrificial anode installation to protect hulls and running gear.
Emergency Services, Salvage & Tug
Sinking or on-bottom vessel? Call before fines and damage stack up. 24/7 propeller and tool retrieval, tug assistance, and access to barges, cranes, towing, and support vessels for commercial operations.
Commercial Marine Construction
Piers, piles, pipelines, outfalls & infrastructure
Experienced dive support for marine contractors, ports, utilities, and heavy civil projects — from pile repair and concrete placement to cofferdams and cable lay. Based in Seattle and available to bid commercial marine construction projects worldwide.
Underwater Welding & Fabrication
Certified underwater welders cutting, welding, and custom-fabricating to spec — weld-on anodes, pile can repairs, and pile/pier/dock repair using underwater chainsaws and specialty tools.
Cofferdams & Keel Coolers
Cofferdam fabrication and installation, plus keel cooler repair and maintenance to keep critical systems online.
Transducers, Intakes & Cable Lay
Transducer replacement, sea-water intake cleaning, and underwater cable lay support for marine and industrial clients.
Concrete Placement & Repair
Underwater concrete placement and structural repair for piles, footings, bridges, dams, and other marine and waterfront infrastructure.
Inspections & NDT
Full inspection services for boathouses, piers, piles, docks, outfalls, intakes, and pipelines. Non-destructive testing (NDT) and thickness readings on wood, steel, and concrete, delivered with photos, video, and written reports.
Consulting & Technical Advisory
Underwater operations, equipment manufacturing & pressurized atmospheres
Twenty-six years in the water — offshore oil and gas, hydroelectric, marine construction and inland dive operations — turned into advice you can build a project around. We consult for owners, contractors, manufacturers, insurers and legal teams on how underwater and pressurized work should be planned, equipped and executed safely.
Underwater Operations Consulting
Dive plans, operating procedures and job hazard analyses; feasibility and method reviews for underwater scopes; crew, gear and topside spread requirements; contractor selection and on-site oversight. We help you know what the job really takes before the first diver gets wet.
Equipment Manufacturing & Product Development
Design input, field validation and testing support for dive and marine equipment — helmets and life-support components, umbilicals, hydraulic and pneumatic tooling, moorage hardware and custom fabrications. Practical diver-side feedback for engineers, prototypes proven in real working conditions.
High-Pressure Atmospheres
Hyperbaric and pressurized-environment guidance: surface-supplied and mixed-gas operations, chamber and decompression procedures, gas management and analysis, dive tables and profile selection, and treatment planning coordination. Applied to diving, caisson and tunneling work, and pressure-testing programs.
Low-Pressure & Altitude Atmospheres
Hypobaric and altitude work where standard tables no longer apply — high-elevation reservoirs, dams and mountain lakes, altitude-corrected decompression, flying-after-diving planning, and reduced-pressure equipment behavior. Built on years of hydroelectric and inland dam diving across Montana, Idaho and Wyoming.
Safety Programs, Training & Compliance
Dive safety manuals, emergency and evacuation planning, equipment inspection and maintenance systems, tender and diver training, and audits aligned with recognized commercial diving standards and industry safe-practice guidance.
Technical Review & Expert Support
Independent condition and failure reviews, incident and damage assessments, second opinions on underwater repair recommendations, and documentation support for owners, insurers and counsel — backed by photo, video and written reporting.
Have a project? Need help right now?
Tell us about your vessel, float, or structure. For emergencies, call directly — we answer 24/7.