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A cabin cruiser called Sanity was towed to safety by the Sheerness lifeboat.
The RNLI's volunteer crew of the all-weather George and Ivy Swanson was called by the UK Coastguard at 8.39pm on Wednesday after a report that the eight-metre cabin cruiser had broken down and its two-man crew needed urgent assistance.
The lifeboat found the craft at anchor one mile off shore near Eastchurch Gap, Warden at 9.20pm. Both its engines were not working.
A line was attached and the boat was towed back to the all-tide landing at Queenborough and secured at 10.45pm.
The lifeboat was back on station and ready for service at 10.52pm.