Sonar Inspection of Flooded Shafts and Tunnels
Practical sonar inspection techniques for flooded shafts and tunnels—equipment, survey method, and data interpretation from an ADCI dive supervisor.
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Wet Welding vs Dry Hyperbaric Welding
Comparing wet welding and dry hyperbaric welding from an ADCI-certified dive supervisor's view. Costs, quality, and real job stories.
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3D Photogrammetry for Underwater Structures
Underwater photogrammetry field guide from a state DOT engineer: cameras, lighting, overlap, and processing for measured underwater structures.
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Magnetic Particle Inspection Underwater
Learn how diver NDT teams run magnetic particle inspection underwater, from yoke setup to reading cracks in the steel.
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Hydrographic Survey vs Dive Inspection: Different Questions
A state bridge engineer explains why hydrographic survey and dive inspection answer different questions—and why you usually need both.
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Underwater Video: What Makes a Report Usable in Court
Ensure your underwater video inspection report stands up in court. Discover key requirements for chain of custody, video tech specs, and documentation.
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Multibeam and Bathymetric Survey: Reading the Deliverable
Underwater bridge inspections rely on multibeam bathymetry. Here's how to read the point cloud, spot anomalies, and know what's actually there.
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Debris Field Mapping After a Storm
Learn how we map storm debris on the seafloor with side scan, magnetometer, and ROV - a salvage master's field guide.
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What an ROV Cannot Do
An ADCI dive supervisor explains the real limitations of ROVs for underwater inspection—turbid water, clumsy manipulators, and when to use divers.
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ROV vs Diver: A Cost and Capability Comparison
What's cheaper, an ROV or a diver? Compare real trade-offs in cost, capability, and safety from a 28-year dive supervisor.
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Underwater NDT: Ultrasonic Thickness Testing Explained
How commercial divers perform ultrasonic thickness testing underwater, including the equipment, common pitfalls, and how to report findings.
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Hurricane Aftermath: Marina Recovery Sequencing
Learn the step-by-step sequence to recover a marina after a hurricane, from fuel containment and vessel salvage to permits and rebuilding.
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