Private company

SL Aerospace

Sea Launch was a multinational—Norway, Russia, Ukraine, United States—spacecraft launch company founded in 1995 that provided orbital launch services from 1999 to 2014.1

Last updated Oct 18, 2026.

Overview

1995Founded1
  • Industryspace industry1
  • HeadquartersNyon1
  • Legal formAktiengesellschaft1

Sea Launch was a multinational—Norway, Russia, Ukraine, United States—spacecraft launch company founded in 1995 that provided orbital launch services from 1999 to 2014. The company used a mobile maritime launch platform for equatorial launches of commercial payloads on specialized Zenit-3SL rockets from a former mobile/floating oil drilling rig renamed Odyssey.2

The story

Sea Launch was established in 1995 as a consortium of four companies from Norway, Russia, Ukraine and the United States, managed by Boeing with participation from the other shareholders. The first rocket was launched in March 1999.

On March 17, 2006, it was announced that Jim Maser, the President and General Manager of Sea Launch, would leave the company to join SpaceX as President and Chief Operating Officer.

In June 2009, the provider of the Sea Launch service, Sea Launch Co. LLC, filed for Chapter 11 bankruptcy protection. Sea Launch asserted that it would "continue to maintain all normal business operations after the filing for reorganization." On August 6, 2010, Energia, which already owned 25% of Sea Launch, announced it planned to acquire a controlling interest of 85% in the company. As a result, the company planned to begin land-based launches from the Baikonur Cosmodrome in early 2011, while sea-based launches to be resumed in September 2011.

Sea Launch emerged from bankruptcy effective October 27, 2010. Energia Overseas Limited, a Russian corporation, is majority owner of the reorganized entity, with Boeing and other American companies retaining minority shares.

In 2013, Boeing sued RSC Energia, PO Yuzhnoye and KB Yuzhnoye. According to Boeing the companies refused to pay more than $350 million following the joint venture's bankruptcy filing in 2009.

In mid-2014, following the 2014 Russian military invasion in Ukraine and the subsequent unrest in the eastern part of the country, there were a number of Russian media reports that indicated Sea Launch may be planning to inactivate the Odyssey launch platform. The company formally denied those reports in June 2014, indicating it is continuing to buy Zenit rockets from Ukraine, and is still promoting its launch services to the international market, even in August 2014. However, in August 2014, Sea Launch conducted a reduction of their staff and removed from operating status both the Commander and Odyssey vessels in order to reduce operating costs during a period where they have no launches scheduled until late 2015.

In July 2015, industry experts stated that the Chinese government was considering the purchase of the Sea Launch command ship and launch platform assets, but this was not confirmed by either company or Chinese government officials.

In September 2015, Boeing won a court judgement against the Russian and Ukrainian partners within Sea Launch. The decision set up a court trial planned for November 2015 where Boeing would argue that it was not properly reimbursed for US$356 million of expenses incurred while operating the Sea Launch launch system. This litigation was decided in favor of Boeing on May 12, 2016.

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As of December 2015, Roscosmos and Energia were attempting to find a buyer for the Sea Launch assets, due to the high cost of infrastructure maintenance of approximately US$30 million per year.

In September 2016, S7 Group, owner of S7 Airlines announced they were purchasing Sea Launch. The launch and assembly ship Sea Launch Commander arrived in Russia on March 17, 2020, and was moored at the Slavyanka Shipyard after customs procedures. The launch platform Odyssey arrived at the shipyard on March 30.

In August 2020, Deputy Prime Minister Yuri Borisov told the media on the sidelines of the Army-2020 forum that the floating spaceport Sea Launch, currently based at Russia’s Slavyanka port in the Primorye Territory, will be restored. The news release indicated it would require about 35 billion rubles (roughly $470 million) to restore the platform. Funding was not confirmed at the time of the release.

Borisov indicated that before the floating spaceport left its port Long Beach, California, the United States in accordance with its laws removed all equipment from the command ship and the floating platform. "It’s mostly equipment responsible for positioning, based on GPS technologies. We will be able to replace it with GLONASS solutions. As for the launch system itself, in other words, the equipment needed for bringing the rocket to and placing it at the launch pad and automatically fueling the tanks, all this is done through Russian technologies," Borisov said.

In June 2020, the CEO of Russia’s space corporation Roscosmos, Dmitry Rogozin, said in his column in Forbes magazine that Russian specialists would have to exert considerable efforts to restore the floating spaceport Sea Launch to operation. He said that before its handover to the company S7 all space launch control equipment was dismantled.

From Wikipedia’s article on Sea Launch, shared under CC BY-SA 4.0.3

Products and brands

Ownership and business

Sea Launch was founded by four companies from four countries, which shared the original ownership of offshore Cayman Islands-registered Sea Launch. Ship "Sea Launch" registered Monrovia after reorganising from Chapter 11 bankruptcy in 2010, a majority share of the company was acquired by Russian interests.

The project was helped by Hughes Space and Communications, which in 1995 signed the first contract for 10 launches and 10 options, valued at $1 billion, and Space Systems/Loral, which then signed a five-launch contract.

Total cost of the project has been reported at $583 million in 1996. Chase Manhattan arranged about $400 million in loans in 1996. Loans were later guaranteed against political instability in Russia and Ukraine through 2012 by the World Bank (up to $175 million, of these up to $100 million in Russia and up to $75 million in Ukraine) and the European Bank for Reconstruction and Development (up to $65 million).

Sea Launch has a reciprocal agreement with Arianespace and Mitsubishi Heavy Industries through the Launch Services Alliance, providing assurance in case either company's system is not able to launch a payload for reasons of reliability, capacity, backlog, or otherwise. This was used for the first time in 2004 when Arianespace's Ariane 5 had to reschedule a group of launches for reliability reasons.

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In 1999, shortly after the company was founded, the Sea Launch consortium claimed that their launch-related operating costs would be lower than a land-based equivalent due in part to reduced staff requirements. The platform and command ship have 310 crew members.

Advantages of equatorial ocean-platform based launches

Advantages of equatorial launch site:

The rotational speed of the Earth is greatest at the equator, providing an extra launch "boost".

The need for a "plane change" to the zero degree inclination of geostationary orbit is eliminated, providing a major extra launch "boost". This allows 17.5–25% more mass to be launched to geostationary orbit than the same rocket launched from Cape Canaveral, which is at 28.5 degrees north latitude.

Any orbital inclination could be reached, thus (for example) combining in one launch site the attainable inclinations of both Cape Canaveral and Vandenberg.

Advantages of ocean-based over a conventional land-based launch platform:

An ocean launch reduces risks related to launching over populated areas, providing better safety to third parties.

Absence of range conflicts with other launch systems and a near total absence of ship or overhead air traffic that would constrain launch.

From Wikipedia’s article on Sea Launch, shared under CC BY-SA 4.0.3

Subsidiaries and ownership

Owners

From Wikidata.1

Former names

  • Sea Launch SA1995 to Apr 20181

Timeline

  1. Apr 2018Acquired Acquired by S.P. Korolev Rocket and Space Corporation Energia1
  2. Apr 2018Renamed Name changed to SL Aerospace SA1
  3. 2018Dissolved Dissolved1
  4. 1997Acquisition Acquired SKS Morskoy Start1
  5. 1995Founded Founded1
  6. 1995Acquisition Acquired Odyssey1

Sources

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