CREATE TABLE table_204_100 (id DECIMAL, "date" TEXT, "name of ship" TEXT, "nationality" TEXT, "tonnage" DECIMAL, "fate" TEXT)

what ship is recorded as sunk before the ss eros ?
SELECT "name of ship" FROM table_204_100 WHERE id = (SELECT id FROM table_204_100 WHERE "name of ship" = 'ss eros') - 1
SELECT "name of ship" FROM "table_204_100" WHERE "id" = (SELECT "id" FROM "table_204_100" WHERE "name of ship" = 'ss eros') - 1