What does the phrase “port of refuge expenses” mean?

These are the additional expenses incurred in repairing the damages suffered by a vessel because of the perils insured against as well as those incurred for saving the vessel from such perils, such as the expense of launching or raising the vessel or of towing or navigating it into port for her safety. These are items to be borne by the insurer in addition to a total loss if that afterwards takes place. (Sec. 163)