Three hundred at seventy people were rescued by the RNLI in London last year and their station at Waterloo Bridge is the busiest in the country - yet only 16% of us know they patrol the capital.
Now a new exhibition aims to change that, by shining a light on the men and women of the RNLI who work to keep London's waters safe.
The 52 prints have been erected outside City Hall, and the RNLI hopes by raising awareness they can help raise the £2 million needed to keep the service running in London.
For nearly a decade, professional photographer and volunteer lifeboat crew member Nigel Millard has been capturing the spirit of the RNLI in his photographs. They're now available in his book The Lifeboat: Courage on our Coasts.