John Robert Vernon Dolphin was a British engineer and inventor, who joined the Secret Intelligence Service and then became the Commanding Officer of the top-secret Second World War Special Operations Executive (SOE) "Station IX", where specialist military equipment was developed. During his time there his inventions included the Welman submarine and the Welbike.
Welbike
Model of a Welfreighter Mark III
Modern mobility scooters
Modern indoor rowing machines
The Welman submarine was a Second World War one-man British midget submarine developed by the Special Operations Executive. It only saw action once and was not particularly successful.
Welman with detachable warhead being trialled at Queen Mary Reservoir, Staines