Question: Danish UC submarines were built by the entrepreneur who is CEO of what company?

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Russian submarine Krab (1912): Krab ("Краб" - Crab) was a submarine built for the Imperial Russian Navy.  She was designed by Mikhail Petrovich Nalyotov as the world's first submarine minelayer, although due to construction delays the German UC submarines entered service earlier.  The mines were stowed in two horizontal galleries exiting through the stern.  Diving depth was 45 metres.  This ship was built by the Naval yard in Nikolayev by the Black Sea (now Mykolaiv, Ukraine).  She was ordered in 1908, launched in September 1912 (or early 1913, sources differ) and entered service in 1915.

Vetehinen-class submarine: The "Vetehinen"-class submarine was a Finnish 500 tonne submarine class of three vessels that was designed and built in the 1920s and early 1930s.  The "Vetehinen" class served in the Finnish Navy during World War II.  The class was designed by Dutch dummy company Ingenieurskantoor voor Scheepsbouw den Haag (I.v.S) (set up by Germany after World War I in order to maintain and develop German submarine know-how and to circumvent the limitations set by the Treaty of Versailles) and built by the Finnish Crichton-Vulcan shipyard in Turku.  The class was based on the German World War I Type UB III and Type UC III submarines and served as prototype for Type VII submarines.

Danish UC submarines: The Danish UC submarines are a series of privately designed, built, and operated, subs by Peter Madsen and associates at Ubadsklubben Freya.

United States C-class submarine: The C-class submarines were five United States Navy submarines built by the Fore River Shipbuilding Company in Quincy, Massachusetts, under a subcontract from the Electric Boat Company.  Built between 1906 and 1909, and in commission from 1908 to 1919, all five were subsequently sold for scrap in 1920.  They were considerably larger than the preceding B class at 275 tons submerged vs. 173 tons submerged, and were the first United States submarines with two-shaft propulsion, doubling the machinery of the B class.

Havmanden-class submarine (1911): The "Havmanden" class was a class of six submarines built for the Royal Danish Navy from 1911 to 1914.  Also later known as the A class, the boats were designed by the Austro-Hungarian firm Whitehead & Co. of Fiume.  The first three submarines were built by the company, while the remaining three were constructed under license in Copenhagen.

United States L-class submarine: The United States L-class submarines were a class of 11 submarines built 1914–1917, and were the United States Navy's first attempt at designing and building ocean-going submarines.  At the time there was a significant gap in long-range submarine design compared with other major navies.  The "Group 2" L-boats designed by Lake Torpedo Boat Company ("L-5" through "L-8") were built to slightly different specifications from the other "Group 1" L-boats (which were designed by Electric Boat) and are sometimes considered a separate L-5 class.

German Type UC I submarine: The Type UC I coastal submarines were a class of small minelaying U-boats built in Germany during the early part of World War I.  They were the first operational minelaying submarines in the world (although the Russian submarine "Krab" was laid down earlier).  A total of fifteen boats were built.  The class is sometimes also referred to as the "UC-1" class after  , the class leader.

Nobel &amp; Lessner: The Nobel and Lessner Company was formed in 1912 by the merger of Ludwig Nobel Works and G. A. Lessner Works to build submarines for the Imperial Russian Navy.  Ludwig Nobel specialized in Diesel engines and Lessner had built a very small experimental submarine ("Keta") in 1905.  The engine plant remained in Saint Petersburg, but a new shipyard was built in Reval, Estonia in 1913–14.  The first three submarines contracted for were built by the Admiralty Works while the new shipyard was under construction.  Five submarines were built in 1915–16 before construction was disrupted by the February Revolution of 1917.  The company was renamed as Petrograd Shipyard ("Petrovskaya Verf") in 1916.

Robert W. Conn: Robert W. Conn (born December 1, 1942) is President and Chief Executive Officer of The Kavli Foundation, a U.S. based foundation dedicated to the advancement of basic science research and public interest in science.  A physicist and engineer, Conn is also the current Board Chair of the Science Philanthropy Alliance, an organization that aims to increase private support for basic science research, and Dean Emeritus of the Jacobs School of Engineering at the University of California, San Diego (UC San Diego).  In the 1970s and 1980s, Conn participated in some of the earliest studies of fusion energy as a potential source of electricity, and he served on numerous federal panels, committees, and boards advising the government on the subject.  In the early 1970s, he co-founded the Fusion Technology Institute at the University of Wisconsin-Madison (UW), and in the mid-1980s he led the formation of the Institute of Plasma and Fusion Research at the University of California, Los Angeles (UCLA).  As a university administrator in the 1990s and early 2000s, Conn served as Dean of the School of Engineering at UC San Diego as it established several engineering institutes and programs, including the California Institute for Telecommunications and Information Technology, known as Calit2, the Center for Wireless Communications, and the Whitaker Center for Biomedical Engineering.  While at UC San Diego he also led the effort to establish an endowment for the School of Engineering, which began with major gifts from Irwin and Joan Jacobs.  Irwin M. Jacobs is the co-founder and founding CEO of Qualcomm.  While Conn was dean, the engineering school was renamed in 1998 the Irwin and Joan Jacobs School of Engineering at UC San Diego.  Conn's experience in the private sector includes co-founding in 1986 Plasma & Materials Technologies, Inc. (PMT), and serving as Managing Director of Enterprise Partners Venture Capital (EPVC) from 2002 to 2008.  Over the years he has served on numerous private and public company corporate boards.  Conn joined The Kavli Foundation in 2009.  He helped establish the Science Philanthropy Alliance in 2012.

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.

Supporting paragraphs: Danish UC submarines Peter Madsen (inventor)
Answer: RML Spacelab ApS