A starship's hull integrity is the percent of blocks out of 100 remaining on an active starship.
When a starship's hull integrity drops below 80%, it will sink, drifting and causing explosions that damage ships and players in its path. Exploded blocks of damaged starships will regenerate where they were exploded after 5 minutes.
When a Supercapital starship is destroyed, the central core block in its Supercapital Reactor will be permanently destroyed, causing a large explosion.