[MikeDelta]

Water and ice versions exist, IceCube consists of detectors dug into ice and Super Kamiokande (example) is a big container of ultrapure water (not heavy). Hyper Kamiokande will be even bigger.

https://en.wikipedia.org/wiki/IceCube_Neutrino_Observatory https://en.wikipedia.org/wiki/Super-Kamiokande https://en.wikipedia.org/wiki/Hyper-Kamiokande

[0PingWithJesus]

Most neutrino experiments don't/didn't use heavy water, but the SNO experiment did.

https://en.wikipedia.org/wiki/Sudbury_Neutrino_Observatory