Nevertheless , dry - docking was required to repair the hole in the belt armor .
During the battle , the ship suffered only minor damage ; Helgoland was hit by a single 15 - inch shell , but sustained minimal damage .
Dry - docking was required to repair the hole in the belt armor .
During the battle , the ship suffered only minor damage ; Helgoland was hit by a single 15 - inch shell , but sustained minimal damage .