A Polish woman, 41, was in critical condition this afternoon after a dive at Xatt l-Aħmar in Gozo.
The woman fell unconscious after coming to shore at about 1pm. and was immediately hospitalised, the police said.
Xatt l-Aħmar, below Fort Chambray, is among the most popular diving spots in Gozo.
Magistrate Joanne Vella Cuschieri is heading an inquiry.