Monitoring a hazardous waste repository formed in a drillhole

A hazardous waste repository, comprising:

• a drillhole formed from a terranean surface into at least one subterranean formation of one or more subterranean formations, the at least one subterranean formation suitable for storing hazardous waste, the drillhole comprising:
• an access drillhole that comprises an entry at the terranean surface and extends substantially vertically toward the one or more subterranean formations,
• a storage drillhole coupled to the access drillhole and extending into the at least one subterranean formation, the storage drillhole configured to store one or more hazardous waste canisters that is configured to enclose hazardous waste;
• a casing that extends from at or near the terranean surface into the storage drillhole;
• and
• a monitor borehole formed from the terranean surface into the at least one subterranean formation adjacent the storage drillhole, the monitor borehole sized to receive a measurement instrument run from the terranean surface to a portion of the monitor borehole adjacent the storage drillhole, the measurement instrument configured to detect a distortion of the casing sufficient to prevent or impede extraction of the one or more hazardous waste canisters from the storage drillhole to the entry at the terranean surface.

A hazardous waste repository, comprising:

• a drillhole formed from a terranean surface into at least one subterranean formation of one or more subterranean formations, the at least one subterranean formation suitable for storing hazardous waste, the drillhole comprising:
• an access drillhole that comprises an entry at the terranean surface and extends substantially vertically toward the one or more subterranean formations,
• a storage drillhole coupled to the access drillhole and extending into the at least one subterranean formation, the storage drillhole configured to store one or more hazardous waste canisters that is configured to enclose hazardous waste;
• a casing that extends from at or near the terranean surface into the storage drillhole;
• and
• at least one casing strap positionable on an exterior surface of the casing and configured to detect a distortion of the casing, the casing strap comprising a conductive portion and a non-conductive portion that combine to form a circular member positionable on the exterior surface, the conductive portion electrically coupled through one or more wires to the terranean surface, the non-conductive portion comprising a breakable member configured to break based on the distortion of the casing.