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:
| Date | Name | Nationality | Tonnage\n(GRT) | Fate |
| --- | --- | --- | --- | --- |
| 18 January 1940 | Flandria | Sweden | 1,179 | Sunk |
| 19 January 1940 | Patria | Sweden | 1,188 | Sunk |
| 11 February 1940 | Linda | Estonia | 1,213 | Sunk |
| 4 May 1940 | San Tiburcio | United Kingdom | 5,995 | Sunk (mine) |
| 9 May 1940 | Doris | French Navy | 552 | Sunk |
| 11 May 1940 | Tringa | United Kingdom | 1,930 | Sunk |
| 11 May 1940 | Viiu | Estonia | 1,908 | Sunk |
| 23 May 1940 | Sigurd Faulbaum | Belgium | 3,256 | Sunk |
| 11 May 1944 | Shtorm | Soviet Union | 412 | Damaged |
Question:
which submarine had the most tonnage?
Answer:
San Tiburcio