sentences:  During this period the dockyard was not under direct Crown control but was leased by private entrepreneurs, Henrik Hybertsson and Arendt de Groote.They built the large warship "Vasa", which sank on its maiden voyage on 10 August 1628.Fleming had been involved in the negotiations of the original contract and in maintaining Crown control over the entrepreneurs, and was present at a demonstration of the ship's lack of stability about a month before the ship sailed.