Biggest amateur-built sub sinks—owner is suspected of killing passenger
Believe it or not, there's a crowdsourced, open source non-profit attempting to build a sea-launched suborbital rocket. Called Copenhagen Suborbitals, it even had access to a submarine. A club associated with the venture completed the sub in 2008, designed by Peter Madsen, a Danish inventor who is co-founder of the group. That submarine is now at the bottom of the sea, and Madsen is being held by Danish authorities on suspicion of "unlawful killing"—a precursor charge to manslaughter or murder.