A four-person dive team burns roughly $8,000 to $15,000 a day in day rates, depth pay, and topside support before a single foot of cable gets cut or a single weld gets laid down underwater. Get the job cost wrong on a single contract and you can wipe out a quarter's profit on one bad bid. Commercial diving is one of the few trades where the books have to track pressure, depth, and decompression time as carefully as they track dollars, and most general-purpose bookkeeping setups simply aren't built for that.
If you run an underwater construction, inspection, welding, or salvage operation, your accounting has three problems that a landscaping company or a general contractor never has to think about: equipment that ages by pressure cycles instead of calendar years, a pay structure with five or six separate components stacked on top of each other, and a topside crew that's just as essential to the job as the diver in the water but gets misclassified as overhead more often than not. Here's how to build a chart of accounts and a costing model that actually reflects how a dive operation makes money.
Why Straight-Line Depreciation Undersells Your Saturation Gear
Saturation diving systems, dive control containers, hyperbaric chambers, and umbilical-supplied surface equipment don't wear out the way a truck or a laptop does. A saturation system that sits in a chamber cycling between 300 and 600 feet of simulated depth for weeks at a time accumulates fatigue on seals, valves, and pressure vessels in a way that has almost nothing to do with the calendar.
Applying a flat straight-line schedule to a $2 million saturation system tells you it's worth 80% of cost after year one and ignores the fact that a heavily chartered system with 200 saturation days behind it is mechanically closer to end-of-life than a system that sat idle in the yard. That mismatch shows up two ways: your balance sheet overstates the asset in later years, and you under-budget for the recertification and overhaul costs that hit right when the equipment is actually due for them.
A better approach for major gear (saturation systems, ROVs, dive bells, decompression chambers) is usage-based or units-of-production depreciation, tied to logged pressure cycles or chartered days rather than straight time. Track two numbers per asset: calendar age for tax depreciation (Section 179 and bonus depreciation still apply the way they would for any capital equipment — for 2026, bonus depreciation sits at 100% of cost and the Section 179 cap is $2,560,000), and cumulative operating cycles for internal decision-making about when to schedule the next recertification or replacement. The tax schedule and the "real" schedule don't have to match, and for equipment this expensive, they shouldn't.
Smaller gear — hardhats, umbilicals, communication boxes, hand tools, underwater welding rigs — can stay on conventional depreciation schedules. The distinction that matters is whether an asset's remaining useful life is driven by pressure exposure or by ordinary wear, and only the pressure-exposed equipment needs the more granular tracking.
The Anatomy of a Commercial Diver's Pay Stub
This is where most bookkeeping breaks. A commercial diver's compensation on an offshore job typically stacks several distinct components, and if you lump them into a single "wages" line, you lose the ability to job-cost accurately or to answer basic questions like "what did depth pay cost us on the pipeline inspection contract."
The typical components are:
- Base day rate — a flat rate, commonly $500–$800/day for standard offshore work, paid simply for being on the job regardless of time actually spent underwater.
- Depth pay — a premium that scales with dive depth, often $1–$3 per foot beyond a baseline (frequently 100 feet). A 200-foot dive can carry $100–$300 in depth premium on its own, and depth is the dominant variable separating standard commercial work from elite saturation contracts.
- Saturation pay — for divers living in a pressurized chamber breathing heliox, a daily premium ($500–$1,500) that's owed for every day in saturation, independent of actual working dive time.
- Hazard/dive pay — an hourly or per-dive bonus for actual working time in the water, sometimes layered with a hazardous-duty differential that can run 15–50% of total compensation depending on the job's risk profile.
- Per diem — $50–$150/day for meals and incidentals on remote or offshore assignments, which is generally non-taxable to the extent it doesn't exceed IRS accountable-plan limits, but only if you're actually tracking it as a distinct reimbursement rather than folding it into wages.
- Overtime — offshore projects commonly run 12-hour days, seven days a week, so overtime calculations (time-and-a-half after 8 or 40 hours depending on jurisdiction) apply on top of everything else.
Set up your payroll and your chart of accounts to carry each of these as a separate sub-account under labor cost, mapped to the job. When a client asks why a five-day inspection job cost more than a comparable one last quarter, "depth pay was 40% higher because we were working at 220 feet instead of 90" is a much better answer than a shrug. This level of separation also matters at tax time and for workers' comp audits, since per diem, hazard pay, and base wages can carry different withholding and reporting treatment.
Topside Support Isn't Overhead — It's Direct Labor
A minimum surface-supplied dive team for work in the 30–130 foot range is four people: the diver in the water, a standby diver ready to enter immediately, a dive supervisor, and a tender managing the diver's umbilical. Add life-support technicians for saturation work, plus crane operators and deck crew who keep the diver's air, communications, and equipment running. None of that crew touches the water, and every bit of it is the reason the diver in the water can do the job safely.
The mistake is booking the tender, supervisor, and support crew's wages to a general "operations overhead" account instead of allocating them to the specific job. If a contract requires 4 support personnel for every diver, and you're not costing that ratio into the bid, you're bidding jobs as if a solo contractor could do them. Allocate topside labor the same way you allocate the diver's day rate and depth pay: by job, by day, fully loaded. That's the only way a per-job profitability report tells you the truth, and it's the only way you catch it early when a job's support ratio creeps up (more standby divers required, additional life-support techs for an extended saturation run) and starts eating the margin you bid on.
Certifications and Compliance Costs Are Assets, Not Just Expenses
The Association of Diving Contractors International (ADCI) sets the primary certification framework the industry runs on — air diver, mixed-gas diver, bell/saturation diver, diving supervisor, and life-support technician tiers, each requiring documented training and, critically, dives performed within a 24-month window before certification is granted. Cards are typically valid for five years, and member companies are required to get new hires ADCI-certified within 90 days of employment.
Two things fall out of that for your books. First, certification and recertification costs (training, required dive hours, renewal fees) are a recurring, budgetable cost center — track them by employee and by expiration date so a lapse never surprises you mid-contract, since a diver working without current certification can void your insurance coverage on that job. Second, when a certified diver, supervisor, or life-support tech is on staff, that credential is part of what you're actually billing for. A dive supervisor's day rate reflects the certification and liability they carry, not just their hours — price and cost your labor with that in mind rather than treating credentialed and uncredentialed hours as interchangeable.
Insurance Is Layered, and So Is the Accounting for It
Commercial diving operations typically sit under three overlapping liability frameworks simultaneously: state workers' compensation for shore-based work, the U.S. Longshore and Harbor Workers' Compensation Act (USL&H) for work on or over navigable waters, and the Jones Act for crew classified as seamen — on top of standard general liability, pollution, and marine coverage. Premiums are individually underwritten based on your five-year loss history, safety program, years in business, and the specific services you offer, which means your insurance cost isn't a flat percentage of payroll the way it might be for a landscaping crew.
Because premium classification depends heavily on which framework applies to which worker on which job, keep clean records tying each employee's hours to the applicable coverage category (shore, navigable water, vessel crew) rather than lumping all labor into one bucket. At renewal time, that granularity is what lets your broker (and your insurer) price you accurately instead of defaulting to the worst-case blended rate across your whole crew.
Building a Chart of Accounts That Reflects the Business
Pulling this together, a commercial diving company's chart of accounts should separate at minimum:
- Labor cost by component — base day rate, depth pay, saturation pay, hazard pay, overtime, per diem, each mapped to job and to diver vs. topside support.
- Major equipment — saturation systems, ROVs, dive bells, chambers — tracked with both a tax depreciation schedule and a usage/cycle-based internal schedule.
- Certification and training costs — by employee, with expiration tracking.
- Insurance by coverage category — workers' comp, USL&H, Jones Act, general liability, pollution, marine hull — ideally with labor hours tagged to the applicable framework.
- Job costing by contract — every dollar above rolled up per job, so a completed contract's actual margin is visible against what was bid.
Getting this structure right up front means a contract's true cost — depth premiums, saturation days, the four-person support crew, the insurance layer that job triggers — is visible before you bid the next one, not discovered after.
Keep Your Books as Precise as Your Dive Logs
A commercial diving operation already keeps meticulous logs of depth, pressure, and decompression time because a mistake there is unforgiving. Your financial records deserve the same discipline. Beancount.io offers plain-text accounting that gives you complete transparency and full version-controlled history over every job-costed dollar — no black-box ledgers, no vendor lock-in, and an audit trail as precise as your dive plans. Get started for free and see why finance-minded operators are switching to plain-text accounting.