Rolleimarin

The Rolleimarin was designed to make a Rolleiflex usable in undersea photography, with all controls worked by levers and knobs in the housing connecting onto their equivalents on the camera, which fits snugly inside. The picture above is from an eBay auction, and shows a Rolleimarin mounting an even rarer beast - a purpose-built light meter made by Hugy of Switzerland in matching paint style and again workable at considerable depths. Must have been a bit of a pain having to decompress just to come up to change the film after 12 shots though...

Below is an extract from a sales brochure from the period, detailing the models and capabilities.