Voltaire 1 was sunk by the German Armed Merchant Raider Moewe in WW1
The 1912 photo of the Voltaire, that is the right one is it, as I have come across a Voltaire steam ship out of Liverpool lying at the bottom of the sea off the Pembrokeshire coast 25 miles NE by N off Smalls. sunk by uboat February 11th 1917 carrying food and provisions.
I do not know the tonnage of this one but will try and find out later on. The name Voltaire seems to be a bit unlucky during wars.
The above para comes from my Marauders of the Sea WW1.
Thor. 51.41.40N 05.04.11W
Coaster lying upside down on a muddy bottom. Sank during the War when it was swamped by a following sea. Lots of fish life. Depth down to 25m. Difficult to find, the transits can be obtained from Dive Pembrokeshire. In 1999 during a wreck discovery week, a world war two battery was found. The wreck has started to break up and can now be penetrated with caution. Cargo was coal, sank 18/12/1943, three men killed. In 2002 it has started to break up and has turned on its side, revealing some of its secrets