Data Recovery Case File · Electrical & Environmental Damage · The Sea and the Card

Salt water plus a live battery equals electrolysis: why the card's copper tracks were dissolved rather than worn — the vibrating phone decoded, the honest scope drawn, and the memory read past contacts the sea had eaten

His account was observant at every step, and the observations carry a chemistry lesson. On holiday, the phone went into the sea. He "immediately switched it off — but it promptly turned itself back on and began continuously vibrating for around half an hour," unstoppable, before dying entirely: no charge, no response since. Weeks later, removing the microSD: "it was stuck — and when I eventually prised it out I could see that one or two of the copper tracks were partially worn away." No device now recognises it; the photos and videos aboard are what he wants back. The key decode first, because it reframes the whole card: those tracks weren't worn away. They were dissolved — because sea water plus a powered battery isn't just a soaking, it's an electrolysis cell, and the half-hour of possessed vibrating was the electricity that drove it. This page covers the chemistry, the honest scope (the card is this lab's patient; the phone's own storage is signposted elsewhere), and the road that reads memory past contacts the sea has eaten.

The decode: the chemistry, the vibration, and why the memory outlives the contacts

Why salt water is the worst water — with power aboard: fresh water damages electronics mainly by shorting them; sea water does that and then keeps working. Salt water is an excellent electrolyte, and the moment it bridges a powered circuit, the assembly becomes an unintended electrolysis cell: current flows through the salt solution between traces, and the chemistry that follows strips metal from the conductors themselves — copper migrating off tracks, corrosion products blooming in its place. This is why his observation is so diagnostically exact: tracks "partially worn away" on a card that suffered no abrasion are the signature of electrolytic erosion — the sea ate them, and it needed the battery's help to do it. The stuck card completes the picture: corrosion products swell and glue, which is why it fought its removal.

The half-hour of vibrating, decoded: the phone's possessed behaviour — powering itself on, vibrating uncontrollably, refusing its own off switch — was salt water shorting its control lines: the motor driven by conduction where commands should be, the power circuitry bypassed by the same. Grim to watch, and worse than it looked: those thirty minutes kept the battery pumping current through soaked electronics — maximising the electrolysis everywhere the water reached, card slot included. (The general doctrine, for every future soaking: a wet device's battery wants disconnecting or the device dry-boxed powerless immediately — it's the current, even more than the water, that does the eating. His instant switch-off was exactly right; the phone's self-resurrection stole the benefit.)

The honest scope, and the hopeful anatomy: scope first, drawn plainly: the phone — its internal storage, its board — is a handset-repair specialism and is signposted there without pretence. The card is this lab's patient, and its anatomy is the hopeful part: the eroded copper tracks are the card's doorway, not its memory. The NAND die sits sealed inside the monolith, typically untouched by surface electrolysis — and, crucially, the card's manufacturer built other doors: the internal technological test pads this archive's monolith cases describe, which sit behind the destroyed contact interface and speak the memory's raw protocol directly. A card whose official contacts the sea has eaten is read through the doors the sea never found.

On the bench

Decontamination came first — the card's corrosion products and salt residues cleaned by controlled process, halting the slow chemistry weeks in the drawer had continued — and then the doorway problem was simply bypassed: the monolith's internal technological pads exposed and probed on the PC-3000 Flash Spider Board, the pinout confirmed against the Rusolut VNR database, the eroded external contacts left out of the conversation entirely. The NAND read out clean — the sea's electrolysis had stopped at the surfaces, as it usually does — and reconstruction ran the standard pipeline to a standing filesystem. The holiday's photos and videos were extracted, verified by opening and playback, and delivered; the card that no slot could recognise had never needed its slot again.

The outcome

The photos and videos recovered through the card's internal pads and delivered verified — the sea's damage confined to doors the recovery didn't use. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on success; the handset itself signposted honestly to its own specialism. The chemistry, posted for every coast and poolside: salt water plus a live battery is an electrolysis cell — it dissolves conductors, it doesn't just wet them — a soaked device's power must be cut or exhausted immediately; eroded contacts are a doorway problem over intact memory; and a card the sea has eaten at the edges is very often whole where it counts.

Our case files are drawn from genuine enquiries received by our laboratory over the past ten years, anonymised to protect client confidentiality. Each one describes the diagnostic and recovery procedure our engineers apply to that fault, using the equipment listed.