A total of 11 migrants were rescued off the French coast yesterday (Sunday).
Their craft got into difficulty nearly seven miles west of Boulogne.
The regional operational monitoring and rescue centre at nearby Cap Griz Nez was alerted at 8.20am GMT by the migrants.
A rescue boat was sent out to them but a French navy helicopter was also scrambled to check for other small craft in the area.
The craft that put out the alert contained one women and 10 males including a teenager.
They were found to be suffering from hypothermia but were otherwise safe and well.
They were brought by rescue vessel to Boulogne at 10.30am GMT and handed over to border police.
Details have come from the French Channel and North Sea maritime authority préfecture maritime de la Manche et de la mer du Nord.
They repeated their warnings about the dangers to migrants trying to cross the Channel, one of the world's busiest seaways, in this manner.
The incident happened on the same morning that 13 migrants were rescued off Folkestone.