Believe it or not, there's a crowdsourced, open source non-profit attempting to build a sea-launched suborbital rocket, called Copenhagen Suborbitals, and 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.
Swedish journalist took a trip with Madsen on the sub this week.
Madsen was seen departing with her around 7pm local time on August 10 from Refshale Island (Refshaleøen), an industrial area east of Copenhagen.
But he never made it back to the harbor, and according to the police report, "At 11.00 the submarine suddenly sank and the owner was subsequently rescued on a private motorboat sailing [near] him in port."