At least six people are believed to be dead and another nine injured — six critically — after a tourist submarine sank off of Egypt’s Red Sea coast Thursday.

A tourist submarine believed to be carrying at least 45 Russians sank off the coast of Egypt, killing at least six people, according to the Russian Embassy in Egypt and state media. The tourists were on an excursion to explore the Red Sea when the submarine sank off the Egyptian coast near Hurghada,

At least six Russian tourists, two of them children, died when an Egyptian commercial submarine carrying 50 people sank in the Red Sea near the resort city of Hurghada. The Red Sea Governorate said the submarine had 50 people on board, 45 tourists and five crew, Reuters reported.