A "sinking house" was floated down the River Thames in the early hours as part of an Extinction Rebellion protest to draw attention to rising sea levels.
Activists sent the "classic suburban house" down the water in a bid to "send an SOS to the government on climate inaction" on Sunday morning.
In a statement Extinction Rebellion said: "We are watching, in real-time, as people's lives are destroyed around the world and in the UK; unless action is taken to halt biodiversity loss and reduce greenhouse gas emissions to net zero, these tragedies are set to worsen."
The move came as areas of the UK reeled from mass floods prompted by torrential downpours this week.
"Representing the disastrous realities of projected sea level rises, perhaps the stunt was unnecessary," the statement added.
"As the ongoing flood disaster in Derbyshire and Yorkshire has so starkly illustrated, our homes, businesses and families are at very real risk."
The group also said they believed the recent floods were a national emergency, in contrast to comments made by the Prime Minister Boris Johnson.
Katey Burak and Rob Higgs, who built ‘The Sinking House’ commented: “Sadly, climate-change is something that affects every one of us. We want to respectfully raise awareness of the severity of the impending human-made disaster.
"We need urgent action to address the Climate Emergency and devastation of our beautiful and precious natural world, which is being decimated at an unprecedented and tragic rate. We implore the government to act responsibly and we will continue to make our voices heard until they act."
