Until now, the Classification Societies’ requirements for damaged vessel survival regulate their trim and stability (bulk carriers, tankers, chemical tankers, gas carriers, passenger vessels, and also dry-cargo vessels with length greater than 80 m; for other types only if the damage dimensions are significant). For damage stability calculations of sea-going ships at design stage, the length of the hole is taken as a function of the ship’s length (see Table 2). For ships with a length smaller than 100 m, the design lengths of the holes and the available statistical data are very close. For oil tankers, chemical tankers and gas carriers the design and statistical data are close for lengths up to 200 m. For vessels of greater length, the SOLAS and MARPOL requirement are lagging behind the average statistical data.