According to the Sunderland Port website there are 11 offshore supply boats in Sunderland.
All of them are in the South Dock, so probably in lay-up.
HIGHLAND ENDURANCE East Quay, Hendon Dock
HIGHLAND CHIEFTAIN East Quay, Hendon Dock
HIGHLAND LAIRD East Quay, Hendon Dock
FD INDOMITABLE East Quay, Hendon Dock
PORTOSALVO South-East Oil Berth
HIGHLAND SPIRIT South-East Oil Berth
HIGHLAND BUGLER South-West Oil Berth
D STAR (Ex-HIGHLAND STAR) QE2 Berth
HIGHLAND FORTRESS Jubilee Quay
FD UNBEATABLE Sheers Quay
FD UNTOUCHABLE Sheers Quay
The following photos were taken this afternoon.