Object
Ixta's Tunnel-Blocking Stone
Ixta positions this stone to seal the hidden tunnel beneath the garden, trapping Ian inside and nearly drowning him during his escape attempt. Ian later pries it free, bursting into the temple covered in mud and water. Barbara and the Doctor react with shock to his survival, while the stone's removal reveals Ixta's treachery and opens the path for Ian's volunteer rescue of Susan from the seminary.
2 appearances
Purpose
Block the hidden tunnel entrance to sabotage Ian's escape
Significance
Exposes Ixta's betrayal and heightens group tension; Ian's removal shifts momentum toward Susan's rescue amid rising Aztec threats
Appearances in the Narrative
When this object appears and how it's used