The tragedy happened Sunday afternoon during a family outing to Laillé, near Rennes (35).
A 7 year-old child was walking with his mother and sister in a riding school when he suddenly disappeared.
Immediately, a wide array of research has been put in place, including a dozen cops, a dog team (and a score of firemen with divers of Rennes.
The boy was finally found, around 17: 30, in a pond. The emergency services have discovered the little lying beneath the water.
Firefighters have practiced acts of resuscitation on the casualty before transport, in absolute emergency, to a Hospital south of Rennes.
It is not known this morning that his state of health.