This will be enormously helpful for climate modeling, lack of subsurface oceanic data severely limits accurate long-term prediction.

One of the elephant-sized gaps in our ability to model the climate is that we know our current understanding of subsurface oceanic geochemistry and geophysics is basically fiction, we are routinely surprised in this regard when we actually measure it. The measurements we've based models on have been extremely sparse relative to both the complexity and dynamics of the system. We tend to model it as a relatively dead, static space but we have substantial evidence that suggests this is very far from the truth, we just don't have enough data to understand what drives the actual dynamics. This is one of the biggest inputs for climate behavior and it is by far the biggest hole in our models that prevent us from making useful predictions.