The company advertised itself as 'Submarine Engineers'. It was founded by Augustus Siebe and others.
It was notable for developing the "closed" diving helmet of the standard diving dress and associated equipment. As the helmet was sealed to the diving suit, it was watertight, unlike the previous "open" helmet systems. The new equipment was safer and more efficient and revolutionised underwater work from the 1830s.
They also made frogman's equipment for the British armed forces, and later, sport scuba gear.
Heinke Ltd in London also made diving gear and had connections with Siebe Gorman. See this link (http://www.divingheritage.com/heinke.htm).
Siebe Gorman has now closed down. In its last years it moved to Cwmbran in Wales.
Siebe's 'closed' helmet was bolted onto a modified diving suit based on the open helmet dress, with divers receiving air from a pump on the surface.
Siebe perfected the design of his new diving suit during the salvage operations carried out between 1840 and 1843 on the warship HMS Royal George, sunk in 1782.
Siebe won numerous medals at the 1851 Great Exhibition and the 1855 Paris Exhibition, and was elected an Associate of the Institution of Civil Engineers in 1856.
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