On 12 May 2015 Prof. Dr. hab. inz. Zbigniew Sikora, the Polish DredgDikes partner, a world-famous geotechnical engineer, one of the most important geotechnicians in Poland and a good friend to the project partners passed away after a serious illness. He was laid to rest on 16 May on the comunal cemetary in Kosakowo. We mourn a respectful person and share the sorrow with his family and friends.