Graham Hughes was arrested in Cape Verde in June
A filmmaker from Liverpool who has been arrested for a second time while on a round-the-world charity trip has made contact with his family.
Graham Hughes, 30, is being held without charge in Brazzaville, the capital of the Republic of Congo.
He went to the city as part of a challenge to travel to the UN's 192 member states by public transport.
His brother Alex said: "He didn't sound good at all and we are absolutely terrified for him."
Mr Hughes was allowed a consular visit and during the meeting was able to make a phone call to his parents.
He told them his spectacles had been taken from him and he had not eaten since Friday.
Mr Hughes also said he was not being allowed to take his anti-malaria medication.
Alex Hughes said: "The conditions he described were shocking.
"They have taken away his glasses so he cannot see and he is being held in a filthy cell on a bug-infested mattress."
Police arrested the adventurer at a checkpoint on Thursday when officers accused him of taking pictures of political figures, claims he denies.
His brother added: "They took away his camera and video equipment and they saw for themselves there are no such pictures.
"He said he was told several times he would be released but nothing has happened so far."
The video director was also arrested in June on Santiago, the largest of Cape Verde islands, on suspicion of entering the country illegally. He was released without charge after a week.
A Foreign Office spokesman said the Honorary Consul had asked the authorities in Brazzaville for further information and access to Mr Hughes.
Mr Hughes left his home in West Derby in January on the 56,000-mile trip, on which he hopes to raise £1m for Wateraid.
He is documenting his journey on camera for Lonely Planet Television and National Geographic.