The 30th anniversary of the Marchioness disaster was remembered in a vigil next to the River Thames.
Fifty-one young people died when the pleasure boat Marchioness collided with a dredger and sank in central London in the early hours of August 20 1989.
Survivors and families of the victims on Monday evening joined a procession from Southwark Cathedral to Bankside, next to the site of the accident, where a short service was held.
The names of those who died were read out and petals were thrown into the water.
Boats from the Royal National Lifeboat Institute, the fire and rescue service and Port of London Authority gathered on the river for the crews to pay their respects.
Most of those on board the Marchioness were high flyers from the finance and fashion worlds.
Odette Penwarden, 72, of east London, spoke about how she survived the sinking.
Ms Penwarden managed to escape through a broken window and was rescued by a police boat.
Andrew Dennis, 54, of north London, went to the service to remember his brother Howard and four friends who died in the tragedy.
He expressed his "disbelief" that the boats and bridges on the Thames do not have more safety lights.
"It's so simple. It's not even 9 o'clock and already you can barely see."
Following the death of his brother, Mr Dennis said he spent the following weeks in Paris.
Mr Dennis said there is a "lovely companionship" among the relatives of the victims and the people who survived.
He added: "There's nothing to explain because everyone is suffering the same."