A father and son in a small inflatable dinghy had to be rescued by lifeboat after they drifted into a busy shipping lane near the port of Mostyn.
The pair had wanted to row out to the windfarms off the Prestayn coast, but they found themselves in trouble due to misty weather, an offshore wind and cross-shore tide.
People on the shore reported that a two-metre long inflatable boat had been lost in the mist, so both of Rhyl's lifeboats were launched in anticipation of a possible search for the boat.
A member of the public spotted the boat again, and the local volunteer coastguard team were able to direct the lifeboat crews to the boat.
The man and his young son were in the middle of the busy shipping lane to the port of Mostyn, which is used by numerous windfarm transfer boats and the Airbus wing ferry, trying to row ashore but not making any headway.
The pair were taken on board the lifeboat, as was their dinghy.
The RNLI said neither man was properly equipped for a four-mile journey to the windfarm. They did not have lifejackets, flares, or a means of calling for help.
The lifeboat crew took the casualties back to the Prestatyn shore, where they were then ferried to the beach on the inshore lifeboat, to be met by the coastguards.
The RNLI says the casualties were given safety advice by the coastguard team on their return to shore.