The coastguard helicopter was called to assist after a passenger was taken ill on board a ferry which had recently departed Shetland.
HM Coastguard confirmed it had received a call to attend NorthLink Ferries’ Hrossey at around 9pm this evening (Saturday).
The ferry had departed from Lerwick on the evening sailing to Aberdeen.
However, it returned to the Holmsgarth ferry terminal.
The coastguard later confirmed it related to a medical incident.
The casualty was taken off the ferry and to the Gilbert Bain Hospital in Lerwick.
NorthLink Ferries said the Hrossey arrived in Aberdeen this morning (Sunday) on schedule.