Gawron-class corvette (project 621)

The Gawron class was a planned class of multipurpose corvettes ordered by Polish Navy. The Gawron class was a variant of the MEKO A-100 project developed by the Blohm + Voss shipyard in Germany. Construction of the first ship of the class started in 2001. The project was terminated in February 2012 but in October 2013 a contract was signed to complete the existing hull as a patrol ship by 2016. On 2 July 2015, ORP Ślązak was christened and launched, and on 28 November 2019, ORP Ślązak was officially commissioned into the Polish Navy.

The contract for the construction of seven multi-purpose corvettes was signed on November 27, 2001. It was decided to use the ready-made design of the German Meko A-100 ships, and therefore a license was purchased for them. The keel was laid the next day, November 28, 2001. However, due to the limitation of the Gawron series program by the Ministry of National Defense to only one unit in December 2002, and a significant reduction in financing the construction of the prototype ship, the construction of the first ship in the series encountered financial difficulties. Therefore, the construction of the ship could not proceed in a timely manner. On June 26, 2003, an annex to the original 2001 contract was signed, which abandoned the option for another six ships, which meant that the order was limited to only one vessel. Lack of progress in construction due to insufficient financing resulted in the fact that in February 2012 the Prime Minister decided to close the Gawron corvette program in its entirety and sell the unfinished prototype. In the same year, however, decisions were made to build a patrol unit with limited combat capabilities based on the ship's hull. The prototype unit was launched as a patrol ship in 2015. The name of the vessel was changed from «Gawron» to "Ślązak".

Due to the fact that in 2012 it was decided to convert the unfinished corvette into a patrol unit, a number of changes were introduced to the project. The ship's design was designated 621M. The changes included, among others, space on the side for two boats: one boarding and one working. The ceremonial launching and baptism of the ship took place on July 2, 2015 at the Naval Shipyard in Gdynia. On November 8, 2019, PGZ SA and PGZ Stocznia Wojenna, after successfully completing all tests and shipbuilding and sea trials, handed over Ślązak to the Polish Navy, and on November 28, 2019, the flag of the war was raised on it as an ORP Ślązak patrol corvette.