Aberdeen Coastguard received a request early on Saturday morning, which prompted the rapid response of Invergordon Lifeboat to attend an incident in the Cromarty Firth.
Invergordon RNLI Trent Class Lifeboat and her volunteer crew were launched just before 7.00am to assist the dredger WD Mersey.
The WD Mersey was carrying out dredging operations at Nigg in the Cromarty Firth, when it made contact with a submerged object which holed the vessel and put it in danger of sinking as a result.
Once on scene the lifeboat transferred two crew to the stricken vessel with a salvage pump to assist stem the water ingression.
The lifeboat stood by and later escorted the dredger into Nigg Energy Park dock for an underwater inspection by divers.
The Lifeboat was back along side, refuelled and made ready for service by 11.00am.