Olympic's double bottom hull (foreground) Titanic's keel (background).

Britannic's steam engines on the test bed at Harland & Wolf, the same type of engines were used in the Titanic.

Crankshafts from the Britannic, the same type used on Titanic. The large rings are made primarily from iron and steel but in hindsight they may have wanted to use tungsten carbide rings.

Britannic's turbine casting.

Turbine rotor.