TSS Terschelling - German Bight The following container vessels are at risk of losing containers and touching the seabed during heavy weather and high waves from a north to northwesterly direction: - Container vessels of 100-200m in length. With a wave height of more than 3.3m. Masters must take appropriate measures and alter course if necessary to avoid broaching and coming abeam to the waves. - Container vessels of more than 200m in length. With a wave height over 4.5m. Masters are recommended to follow an alternative route via TSS East Friesland. See for additional information HP 8 diagram 'Increase of draught by rolling'.