Dorota Bankowska, a professional diver, married teacher James Abbott in her home town of Plock in Poland last month but wanted to do something in Scotland where they both live and work.
Abbott had trained at The Underwater Centre at Fort William on the shores of Loch Linnhe in 2007 and approached its staff about hosting the special occasion.
The tank is normally used for training divers and testing new equipment, such as remotely operated vehicles (ROVs).
The bride wore a white wedding dress and the groom a kilt. The clothing was weighted down for the conditions at the bottom of the tank.
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All four of them diving wore deep sea diving helmets and surface-supplied diving equipment.
The rings were presented to the couple by one of the diving centre's yellow ROVs.
The Underwater Centre's air diver training manager Ali McLeod officiated at the ceremony.
About 100 other guests watched the ceremony from outside the tank.
Abbott is a self-employed commercial diver in the oil and gas industry. She is also one of the few women in the world working as a saturation diver.
Like the underwater ceremony in Fort William, there was a splash of tartan at the couple's wedding in Poland, the report said.