I think you have to look at each case, but essentially having an extension by itself is not necessarily a safety problem if it's done right. If someone is considering modifying a vessel, there needs to be an assessment of those changes and the impact on that vessel and its stability, its operation, and so on. If the assessments are done properly and the calculations and the procedures are adjusted accordingly, there is no problem with doing some forms of extensions. Often we find that extensions are made, there is no stability assessment, there is no risk assessment of the extra weight that might be carried, and so on, and that leads to the accidents that we end up investigating.
