Eight men suspected of hijacking the Arctic Sea cargo ship are being questioned by Russian investigators after their mysterious ocean odyssey came to an end. A plane carrying the two Russians, two Latvians and four Estonians arrived in Moscow earlier.Russian warships found the merchant vessel in the Atlantic Ocean off the Cape Verde islands on Monday. It had reportedly been as missing for two weeks. Prosecutors say the men had hijacked the ship on July 24 off the Swedish coast and then threatened to blow it up if their ransom demands were not met. Eleven of the 15 Russian crew have also returned home. The rest have stayed on board the vessel as the investigation continues. Russian authorities have revealed little and it seems it will be some time before the truth about what happened to the Arctic Sea becomes known.