Although never completed or commissioned, these Second World War bunkers in Cashmere are highly significance as a product of the perceived threat the Japanese posed to New Zealand in the early years of WWII.

Second World War Bunkers/Cracroft Caverns, 64H Hackthorne Road, CashmereSecond World War Bunkers/Cracroft Caverns, 64H Hackthorne Road, Cashmere

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Summary

Heritage status

District Plan: Highly significant.

Heritage New Zealand: None.

Conservation plan

No.

Authenticity High.
Current status Closed, not safe to enter.
Repair status Awaiting repair.
Geographic level of significance Metropolitan.
Community Board Spreydon-Cashmere.
Restrictions Refer to legislation and guiding documentation below.
Land title Lot 43 DP 69643, CB40C/372, Fee Simple, 7087m2.
District plan zoning Open Space Community Zone.
Pre-earthquake use Commercial (research).
Background

Due to the perceived threat from the Japanese in the early stages of WWII the bunkers were excavated for an Operational Centre. The threat receded and they were never finished and were forgotten until ‘rediscovered’ in 1987. Christchurch City Council assumed ownership in 1996.

Risks

The Caverns are monitored and stable.

Meets new building standard >67% No.
Environment Canterbury hazardous activities and industries list information (HAIL) Not listed as a HAIL site, as of December 2017.
Reports available

Preliminary Geotechnical Assessment Report.

Estimated minimum cost to restore

$1,700,000 (This figure is not based on actual engineering costs but is indicative only from preliminary investigations).

 


Definitions 

District plan heritage status - highly significant

To be categorised as meeting the level of ‘Highly Significant’, the historic heritage shall: meet at least one of the heritage values in Appendix 9.3.7.1(external link)(external link) at a highly significant level; and be of high overall significance to the Christchurch District (and may also be of significance nationally or internationally), because it conveys important aspects of the Christchurch District’s cultural and historical themes and activities, and thereby makes a strong contribution to the Christchurch District’s sense of place and identity; and have a high degree of authenticity (based on physical and documentary evidence); and have a high degree of integrity (particularly whole or intact heritage fabric and heritage values).

Meets new building standard >67%

% NBS is essentially the assessed structural standard achieved in the building (taking into consideration all reasonably available information) compared with requirements for a new building and expressed as a percentage. There are several steps involved in determining %NBS, as outlined in the following sections.

A %NBS of less than 34 (the limit in the legislation is actually one third) means that the building is assessed as potentially earthquake prone in terms of the Building Act and a more detailed evaluation of it will typically be required.

A %NBS of 34 or greater means that the building is regarded as outside the requirements of the earthquake prone building provisions of the Building Act. No further action on this building will be required by law. However, if %NBS is less than 67 it will still be considered as representing an unacceptable risk and further work on it is recommended.

A %NBS of 67 or greater means that the building is not considered to be a significant earthquake risk.

Environment Canterbury hazardous activities and industries list information

Environment Canterbury manages information about land that is, or has been, associated with the use, storage or disposal of hazardous substances. This is called the Hazardous Activities and Industries List (HAIL). The HAIL has 53 different activities, and includes land uses such as fuel storage sites, orchards, timber treatment yards, landfills, sheep dips and any other activities where hazardous substances could cause land and water contamination. 

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