The lower deck.

1

1835.  [You] quit the cabin for the seats on the boiler-deck, or still better, for the hurricane-deck above.—C. J. Latrobe, ‘The Rambler in North America,’ i. 223 (N.Y.).

2

1838.  He had followed his friend, the Kentuckian, to the boiler-deck, where, as usual, remarkable cases of boiler-burstings, burnings, snaggings, &c. were told.—R. M. Bird, ‘Peter Pilgrim,’ i. 86 (Phila.).

3

1875.  See TEXAS-DECK.

4