I visited Durie Hill in Whanganui NZ which has this 213 metre long tunnel, with a vertical escalator/lift at the end, which takes you up to a panoramic viewpoint…
On first visit yesterday, performing handclaps was unreal as there is actually a flat wall at the end of the tunnel – the elevator entrance is around a corner… So a clap excites the verb in the tunnel, then a huge slap echo bounces back and excites the tunnel verb again! Depending where you stand when you make a sound, you can vary the time until the slap delay occurs & it got quite ‘zingy’ sounding & almost sounded like a ricochet at times…
This morning I went & got some balloons – I had my starter pistol in the car, but this is a public place… and I wasn’t keen for a Police armed offenders callout… Will see if I can deconvolve it into an IR…
Note to self: in future always have a pack of balloons in my recorder bag. The SPL and impulse from a ballon pop in such a confined space was VERY effective!