Question: What was the length of the midget submarine built in 2005 by the founder and CEO of RML Spacelab ApS?
Sentence (from "Peter Madsen (inventor)"): Peter Langkjær Madsen (] ; born 12 January 1971) is a Danish aerospace engineering enthusiast, "art engineer", submarine builder, entrepreneur, co-founder of the non-profit organization Copenhagen Suborbitals, and founder and CEO of RML Spacelab ApS.
Relevant evidence: Yes