1992. Henk Oostenveld
An article on the Henk Oostenveld diving helmet is not yet ready but we found some photographs:
Henk Oostenveld testdives the helmet and system he built himself. The photographs were taken in September 1992 at some nautical 3 miles North off Vlieland, the Netherlands.
These photo's were taken in August 1992; a test dive was performed in the harbour of the island of Terschelling.
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