RNLI volunteers have asked people not to put extra strain on their services after they made their third Sully Island rescue in two weeks.
The RNLI crew at Barry Dock launched on Monday afternoon to rescue four people cut off by the tide.
The group were taken back to shore and had been trying to walk to Sully Island.
The RNLI is reminding people to follow government lockdown advice and asking people to check conditions before they set off so they do not add to their already stretched service.
The RNLI have published the following advice to help people keep safe in water.
Take care if walking near cliffs - know your route and your limitations
Check the weather forecast and tide times before you set off
If going afloat, carry a means for calling for help and always wear a lifejacket
If you fall into the water unexpectedly FLOAT TO LIVE. Fight your instinct to thrash around, lean back, extend your arms and legs, and float
In any coastal emergency, dial 999 or 112 and ask for the coastguard