Echo isn't the same as reverb. Reverb is a simulation of acoustic spaces small enough that you don't hear distinct echoes. You need multiple short delays to simulate the time taken for sound to travel between surfaces of the room, and feedback between them to simulate the reflections. AFAIK all tape delays are too slow to produce reverb sounds.

Recording studios have had access to tunnels to create echos.

https://www.acontinuouslean.com/2013/12/02/secret-capitol-st...