Copenhagen Suborbitals, a hobbyist group which assisted in the construction of the UC3 Nautilus, is attempting to build a manned space capsule to launch 100 kilometers skyward, beyond the Karman Line where the Earth’s atmosphere gives way to outer space. It is largely crowdfunded and staffed by approximately 50 volunteers; Madsen left in 2014 amid a rocky relationship with other members of the group. That year, a group called the U3 Nautilus Submarine Association was formed to manage the vessel, but later ceded control to Madsen.