The five Italians drowned while in a deep underwater cave in remote seas on Thursday, and Maldivian authorities recovered one body later that day.
A rescue diver from the Maldivian National Defense Force also died in hospital on Saturday from decompression-related complications after surfacing during the search, which was later suspended.
Italy, Britain and Australia have already provided assistance in the search for the remaining four Italians in difficult and dangerous conditions, chief government spokesman Mohamed Hussain Shareef told AFP.
"Three Finnish experts from DAN (Divers Alert Network), commissioned by the Italian government, arrived today and will join the search, most probably on Monday," Shareef said.
The United States had also offered help, he said.
