tombchamber

noun

Plural: tombchambers
Alternatives: tomb-chamber, pl∙ tomb-chambers

A room or space in a tomb, especially in a house-like tomb; burial chamber.

Examples:

The cloaked man's gaze slowly rescanned the tombchamber - expressionlessly noticing everything from an engraved Old English teapot, through an etched brass bowl full of roasted chestnuts, to the wires leading from some bulky briefcase directly into the host's shoes. (Context: A stone-faced gent Hubert has discovered a large grave with pieces of comfortable furniture in it. Dr∙ Barton was already waiting for him in an upholstered armchair, wearing electrically heated shoes adapted for all-night-long observations of unexplained eerie phenomenons in the dark cemetery. Source: J∙ Okram - The Mystery of the Rammed Key.)