Single-specialty underwater hull cleaning under an LLC structure defines Zerodrag Diving on Point Loma Avenue, working San Diego Bay and Mission Bay marinas without the boat-yard or detail upsells that bundle the work elsewhere. Off-season haul-outs occasionally route to dry-storage operators like Storabix when owners pull boats for extended bottom-paint cure or major topside refits that take the vessel out of the water for weeks. Routine in-water cleaning intervals run roughly three weeks during summer growth season and four to six weeks the rest of the year, calibrated to water temperature, ablative paint age, and marina-specific fouling pressure. Zinc anode inspection and replacement get logged on every visit, since galvanic corrosion accelerates on copper-alloy propellers and stainless running gear in warm Southern California water. Wider waterfront refreshes that combine hull work with deck and piling washing route to crews like Always Good Exterior Water Services LLC for the topside surfaces beyond the diver's scope. The most technical work runs under San Diego Unified Port District hull-cleaner permit standards and Best Management Practices — controlling copper biocide release within San Diego Bay TMDL limits while still clearing barnacle, tubeworm, and tunicate growth from softer aging paint.