To a 65m dredger "heron" taking on water off St Annes Head with five persons on board.
Two lifeboat crew and a salvage pump were put on the listing vessel to give assistance.
A Pilot was put on board and the lifeboat escorted the vessel into the marina.
The two lifeboat crew members stayed aboard the dredger until she was inside the lockgates.

Launched after a 54-foot fishing vessel sank off the South Pembrokeshire coast. The Jersey-registered Kerloch (J235) was on passage from Lundy Island to Milford Haven when she struck Crow Rock, near Linney Head.
Her crew of four men took to a liferaft and were picked up by another fishing boat, the Dolly Anne. The survivors, reported to be shaken but not suffering from hypothermia, were subsequently transferred to Angle lifeboat and taken to the Milford Haven Port Authority jetty.
There, they were met by the Dale Coastguard Rescue Team and an ambulance, which had been called as a precaution.