The “Louise Michel,” a former French naval boat, helped to rescue 89 people on Thursday, according to a spokesperson for the vessel.
Its 10-person crew later provided help to a further 130 people, including “many women and children,” a post on the boat’s Twitter account said on Friday evening.
The message added that the boat was “reaching a state of emergency” and needed “immediate assistance.”
The vessel said in a series of tweets on Saturday that it was “unable to move” due to its “overcrowded deck,” alleging that no European coastguards have responded to its calls for help. CNN is unable to independently verify this claim.
Thirty-three of the passengers remain “on a life raft” with one deceased person in a body bag, the Twitter account added.
Referring to the refugees it is safeguarding, the boat said they have “experienced extreme trauma” and need to reach a “place of safety.”
In an update posted on Twitter on Saturday afternoon, the Louise Michel said its crew members were still waiting for assistance half a day later.
“The crew managed to keep #LouiseMichel stable for almost 12h now. Our new friends told us they lost 3 friends on their journey already. Including the dead body in our one life raft, that makes 4 lives vanished because of Fortress Europe,” it said in its most recent tweet.
The pink vessel, named after a French anarchist and bought by Banksy from the proceeds of one of his artworks, aims to “uphold maritime law and rescue anyone in peril without prejudice,” according to the project’s website.
The artist spray-painted the boat with a fire extinguisher and also created an artwork of a girl in a life jacket, who is shown stretching out one hand towards a heart-shaped lifebelt.
The image bears a resemblance to the artist’s famous “Girl with Balloon” stencil murals.
As well as being customized for search and rescue operations, the Louise Michel is “captained and crewed by a team of rescue professionals drawn from across Europe,” the boat’s website added.
It is 30 meters in length and can travel at a speed of 28 knots per hour.
CNN’s Sara Spary and Oscar Holland contributed to this report.