Hi I am looking for some info on the Irisbank around 1975-76

I was wondering if anyone was on board any time during? My Uncle John Robert (Bobbie) Sweeney was on board and lost at sea on 10th May 1976, I think near Bizerte in Tunisia. The Captain at the time is Capt D Stewart.

I am doing some family tree research and looking in to his disappearance as part of that.

Does anyone know anyone on board around this time or in the preceding years?

Thanks.

Neil Stokoe