CREATE TABLE table_203_193 (id DECIMAL, "ship name" TEXT, "in service" DECIMAL, "project number" TEXT, "type" TEXT, "class" TEXT, "comments" TEXT)

which ship is the only container ship listed ?
SELECT "ship name" FROM table_203_193 WHERE "type" = 'container ship'
SELECT "ship name" FROM "table_203_193" WHERE "type" = 'container ship'