Immacolata Concezione was a screw corvette of the Papal Navy, built in the English shipyards of Thames Ironworks and Shipbuilding Company in Blackwall and launched in 1858.

It was originally intended to be the papal yacht, in view of overseas voyages, and initially a pilgrimage to the Holy Land which, for reasons related to the political situation of time, was not fulfilled.

Remarkable was a trip to the Mediterranean with scientific purposes made in 1865, in which father Angelo Secchi carried out some experiments on the transparency of water.

[3] After the Capture of Rome, the ship was registered in the rolls of the Royal Italian Navy, but left at the disposal of the Pope, who never used it due to voluntary confinement in the Vatican in 1871.

The Loire would later allegedly be beached near Ajaccio after being near totally destroyed by a fire, though it is unclear if this was truly the original Immacolata Concezione or simply another ship mistaken for it.