#ballasting

Ship launching: Ship launching is the process of transferring a vessel to the water.. Ship launching imposes stresses on the ship not met during normal operation and in addition to the size and weight of the vessel represents a considerable engineering challenge as well as a public spectacle. There are three principal methods of conveying a new ship from building site to water, only two of which are called "launching". The oldest, most familiar, and most widely used is the end-on launch, in which the vessel slides down an inclined slipway, usually stern first. Wikipedia

When at port, ballasting and de-ballasting operations happen and are prone to faults and accidents; see what has to be considered to avoid some problems.