Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Estimate | Name | Nat. | Ship Type | Principal victims | Date |
| --- | --- | --- | --- | --- | --- |
| 1255.0 | HMS Queen Mary | UK | Battlecruiser | Crew | May 31, 1916 |
| 1198.0 | RMS Lusitania | UK | Ocean Liner | Civilians | May 7, 1915 |
| 1015.0 | HMS Invincible | UK | Battlecruiser | Crew | May 31, 1916 |
| 1013.0 | HMS Indefatigable | UK | Battlecruiser | Crew | May 31, 1916 |
| 903.0 | HMS Defence | UK | Armoured cruiser | Crew | May 31, 1916 |
| 900.0 | HMS Good Hope | UK | Armoured Cruiser | Crew | Nov 1, 1914 |
| 857.0 | HMS Black Prince | UK | Armoured Cruiser | Crew | May 31, 1916 |
| 843.0 | HMS Vanguard | UK | Battleship | Crew | Jul 19, 1917 |
| 839.0 | SMS Pommern | Ger | Battleship | Crew | Jun 1, 1916 |
| 782.0 | SMS Blücher | Ger | Armoured Cruiser | Crew | Jan 24, 1915 |
| 764.0 | SMS Scharnhorst | Ger | Armoured Cruiser | Crew | Dec 8, 1914 |
| 750.0 | HMS Monmouth | UK | Armoured Cruiser | Crew | Nov 1, 1914 |
| 738.0 | HMS Bulwark | UK | Battleship | Crew | Nov 26, 1914 |
| 648.0 | Suffren | Fr | Battleship | Crew | Nov 26, 1916 |
| 646.0 | SS Mendi | UK | Troopship | Troops | Feb 21, 1917 |
| 600.0 | Bouvet | Fr | Battleship | Crew | Mar 18, 1915 |
| 501.0 | RMS Leinster | UK | Mail Ship | Military personnel | Oct 10, 1918 |
| 577.0 | SMS Gneisenau | Ger | Armoured Cruiser | Crew | Dec 8, 1914 |
| 570.0 | HMS Goliath | UK | Battleship | Crew | May 13, 1915 |
| 460.0 | HMS Hawke | UK | Cruiser | Crew | Oct 15, 1914 |
Question:
What is the nationality of the ship when the principle victims are civilians?
Answer:
UK