I’ve read that drilling down to reach a potential liquid ocean to search for life would be a very difficult process and runs the risk of contaminating the environment.

I wonder if we could eventually send down a robotic probe to the service to look for signs of life ejected by one of those plumes. It seems like the plumes would transport materials and maybe even microbes from deeper down. Before landing a sampler mission, we might start with a flyby that captures samples of the plume and looks for signs of life.