user: Question: Name the vessel type for DOF Subsea
Columns: ['No. in series', 'No. in season', 'Title', 'Vessel Type', 'Vessel Operator', 'Narrated by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [20.0, 1.0, '"MV Beluga Bremen"', 'Cargo Ship', 'Beluga Shipping', 'Anthony Green', 2011.0]
SQL:

assistant: SELECT "Vessel Type" FROM "Table" WHERE "Vessel Operator" = 'DOF Subsea';