New answers tagged echo
This can be done with Audacity's 'Echo' effect. You can set the Time delay to a small number (0.1 for example) and a smallish time decay factor (0.4?) to get the effect of 'being trapped in a large empty room'. But what it sounds like here is that they've kept the original as is and then used an altered copy of the same soundtrack with maybe half of a second ...
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