MARINE survey ship the Ocean Observer was towed into Lerwick on Friday morning after suffering propellor problems.
The large vessel first lost power late on Wednesday evening around 90 miles east of Sumburgh.
The coastguard’s emergency towing vessel was dispatched but the process was delayed due to contracts having to be signed with the vessel’s owner.
The survey ship eventually started being towed on Thursday afternoon, with Lerwick Port Authority tugs on hand to help when it reached Lerwick.
The coastguard said the vessel was never in any danger.