The evening's rising tide strands two children and the adults who waded out to rescue them.
The emergency services were phoned at just after 6.30pm on Thursday (18 May).
Two children had became stranded on Houmet Besne, the islet just to the east of Bordeaux harbour.
The two adults who tried to get them off also became stranded, and the currents at Bordeaux are notoriously strong.
St Peter Port's inshore lifeboat was launched at 6.30pm and had put the four safely ashore at Bordeaux pier by 7.05pm.
Last week, the RNLI announced that the vessel had become a permanent addition to its life-saving assets in Guernsey.
Guernsey teen set for month-long marathon swim
Guernsey Post introduce new services from early July
Guernsey Waste improves the quality of its free garden compost
Guernsey cat lover to ride the length of Britain in nine days
Unclaimed CI Co-op cash funds community projects
Work to commence on 70 affordable flats and homes in Guernsey
A new tax, more 'proportionate' to wealth, to be put to Guernsey's States
Guernsey gives £75k for Islands Unlimited inter-islands sailings
