From surface flecks to weakened interior. More than a decade of cross-disciplinary research is strengthening our understanding of what is going on inside Vasa's wood.
Iron from rusted bolts and cannon balls has diffused into Vasa's wood since its time on the seabed. Iron can speed up deterioration of both wood components and the conservation agent polyethylene glycol, PEG. It is therefore important to determine by what means iron can be removed from Vasa wood.
Geodetic measuring is undertaken in order to monitor and map the deformation of Vasa's hull. We have chosen this particular geodetic measuring system as it is extremely accurate, showing deformation of less than 1 mm.
Maintaining a stable climate is one of the most important aspects in preserving archaeological materials.
The bolts holding Vasa together are corroding and thereby weakening the ship's structure. To improve structural stability, we are now replacing around 5000 bolts. The work is reckoned to be finished by late 2017.
The strength of Vasa's timbers is substantially reduced in a number of locations, according to new research. An improved support design is the goal of the current research project, Support Vasa.