Is a chain fusion reaction of deuterium oxide (heavy water).possible?

I think it is the case that at very high temperatures that two deuterium atoms can be made to fuse to produce helium and a release of energy. I think under appropriate physical conditions this can lead to a chain fusion reaction, although I might be wrong. My nuclear physics.lectures at university were pretty poor and long ago.

If I am not wrong about this, then my question is: if a high enough stimulus, eg, pressure/temperature.of a critical mass of deuterium oxide heavy water were achieved, within say a hypothetical ocean of pure such heavy water, could this water be made to undergo a sustained.chained fusion reaction? I..e could this.entire hyptetical ocean detonate in a nuclear.fusion reaction

• You would need a stellar-mass object, and at the point where any reactions were occurring, you'd have a plasma, not water nor even disassociated but un-ionized hydrogen and oxygen. You may also want to study up on current efforts for terrestrial fusion reactors -- I think all of the proposed mixes at least include deuterium; I don't think anyone is seriously contemplating using straight ${}^1H$. – TimWescott Sep 28 '19 at 16:53