Put on the hatches. Figuratively, shut the door. (Anglo-Saxon,
hæc a gate. Compare haca, a bar or bolt.)
Dead and buried. The hatches of a ship are the coverings over the
hatchways (or openings in the deck of a vessel) to allow of cargo,
etc., being easily discharged.
And though his soul has gone aloft,
His body's under hatches.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894