Page "Krupp" Paragraph 57

Krupp Steel Works of Essen, Germany, manufactured the spherical pressure chamber of the dive vessel Trieste, the first vessel to take humans to the deepest known point in the oceans, accomplished in 1960.

This was a heavy duty replacement for the original pressure sphere ( made in Italy by Acciaierie Terni ) and was manufactured in three finely-machined sections: an equatorial ring and two hemispherical caps.

The sphere weighed 13 metric tons in air ( eight metric tons in water ) with walls that were 12. 7 centimetres ( 5. 0 in ) thick.