Related Clues:

• -ogram opener
• Undercroft
• Subterranean vault
• Vampire's home, perhaps
• Underground room
• Cemetery feature
• Sepulchre
• Place for 43-Across
• Underground cell
• Underground burial chamber
• Underground chamber for burials
• Start to weep of late down there
• Church vault
• Eerie meeting site
• Keen, exercising for vault