Peter Madsen born 12 January 1971, is an artist, submarine builder, aerospace engineer, entrepreneur and co-founder of Copenhagen Suborbitals; a private non-profit spaceflight organization.
Madsen worked on the UC3 Nautilus, a privately built Danish submarine. It was launched on 3 May 2008 in Copenhagen, Denmark. It was constructed over a three-year period and it cost approximately US$200,000 to build (1.5 million in DKK).
On May 1, 2008, Peter Madsen along with Kristian von Bengtson founded Copenhagen Suborbitals. In June 2014 Peter Madsen left the project. Peter Madsen was responsible for the rocket engines.
In June 2014, Rocket Madsen Space Lab was established by Peter Madsen. The goal is still the development and construction of a manned spacecraft.