Box caissons, the type of deep foundation, is subject of the analysis of this thesis. Types of box caissons, their applications and principles of their design and building are given in this thesis. The floating box caisson is chosen to be revised and analysed in detail. Floating box caisson is built on the dry land and then being towed by a tugboat to his installation location, which makes it unique. The main goal of this thesis, beside of expanding the theoretical knowledge about box caissons, is to calculate its stabilty while its being towed. The equations and definitions of ship stability are applied to a box caisson as it is interpreted as an object floating in the sea with simpler geometry then a ship. Box caisson parameters are taken from the main project „Liquified natural gas (LNG) import terminal on Krk island“, where they will be used for foundating harbour jetties and bridge columns of a floating terminal. The calculation of stability is made for tugging the box caisson from its place of construction to the location near the city Omišalj, with hypothesis that its being constructed in one of the Kvarner bays two shipyards. The stability calculation is made for the measured wind and wave load. The thesis gives the review of the results, conclusions and suggestions.