The crew worked closely with the Coastguard and paramedics to help the gentleman who is now making a good recovery.
The lifeboat had already helped the fishing boat, Charlie's Dreams, and its occupants in the early hours of Saturday near the Rhyminey River in the Bristol Channel, when they had towed the boat into Cardiff after it suffered engine problems. Now on it's way back to its original launch site after its engine was fixed and with two people on board, the boat had been reported as overdue.
The Coastguard asked Penarth lifeboat crew and land-based coastguard teams to help look for the boat. The coastguard team located the boat and directed the lifeboat to it.
When the Atlantic inshore lifeboat arrived they took one woman suffering from seasickness off and began to tow the boat back to harbour.
During the tow, the man on board, Darren Wembridge, said he was experiencing severe chest pains and the crew swiftly called on their colleagues in the D class inshore lifeboat, who were helping another boat elsewhere, to help.
The crew helped Darren onto the lifeboat and gave him advanced first aid as they took him quickly to a waiting ambulance. The crew transferred him to the paramedics who took him to hospital.
Darren said: 'Thank you for everything you have done for me and my partner over the weekend. I am forever grateful.'
Jason Dunlop, volunteer crew at Penarth and one of those treating Darren, said: 'It was a real team effort - the Coastguard team searched up the coast and spotted the boat, which meant that we could get there really quickly. Once we'd rescued him we were then able to pass him onto the paramedics.'
Jason continued: 'It just goes to show that telling someone when you're due back in harbour can be a lifesaver. We were there to help Darren because someone had reported the boat as overdue - we were in the right place at the right time and are so pleased to have been able to help Darren and hear that he is making a good recovery.'
The dramatic rescue came after a busy day for the Penarth crew. As well as the two launches to the fishing boat Charlie's Dreams, the crew had also helped a sailing boat at 11am. They were towing that boat back to harbour when it started taking on water and the crew were forced to beach it. They returned at 6pm to help refloat the yacht and make sure it was no longer taking on water. The yacht had been safely refloated when the call came for the D class inshore lifeboat to help the casualty suffering from chest pains.