The men were intercepted along with two smugglers after setting off from the tiny Gulf kingdom towards the Iranian coast, the official Bahrain News Agency (BNA) said.
Bahrain News Agency | Trafficking attempt of 8 fugitives to Iran foiled https://t.co/1szCziFG8d
— Bahrain News Agency (@bna_en) June 4, 2016
The agency published the men's names and said that seven had been sentenced to between 10 to 15 years in prison for "terrorism" activity and the eighth one was wanted also on terrorism charges, it said.
The men's attempt to cross the 193 kilometre (120 mile) stretch of water to the Iranian coast was planned by two Bahraini fugitives, BNA said.
Bahrain jails 19 Shias for attacks on police
One of the men has been convicted to life and the other to 10 years in prison, it said, adding that both had escaped previously to Iran.
The incident follows a jailbreak late on Friday in which 17 prisoners fled Al-Hadd jail near the dry dock on the island of Muharraq, east of the capital Manama.
On Saturday security forces recaptured 11 of the inmates, the interior ministry said but gave no indication of whether they were common criminals or political prisoners jailed in a sweeping five-year-old crackdown on dissent among the kingdom's Shia majority.
Sunni-ruled Bahrain lies across the Gulf from Iran and is home to the US Navy's Fifth fleet.
Shia clerics in Sunni-ruled Bahrain demand equality
Relations between the two neighbours are tense and Manama has repeatedly accused Tehran of interfering in its affairs and inciting violence in the country.
Bahrain has been shaken by unrest since its Sunni minority rulers crushed a month-long, Shia-led uprising demanding reforms in 2011.
Despite the crackdown, protesters frequently attack police in Shia villages outside the capital Manama.
Bahraini courts have sentenced suspects convicted of violence to long prison sentences, while authorities regularly blame "terrorists" with alleged Iranian backing for stirring up unrest in the country.
Manama denies it discriminates against Bahraini Shia, but members of the community are currently in prison including opposition leader Sheikh Ali Salman.
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