You can hedge your bets on the oceans, and especially the Mariana trench. The fact that oceans cover more than 70 percent of the earth, and we still don't have the technology or capabilities to even explore most of it - especially the deepest  location of ocean and the lowest location on earth, the Mariana trench. It's amazing that we think we know so much about earth, the geology, the species, yet nearly 80 percent of the oceans have never even been explored or mapped. And mind you, as I said 70 percent of Earth's is composed of oceans. So 80 percent of that 70 percent, equally 56 percent of the entire earth, has never been seen or explored or mapped or experienced. We've seen the highest location on earth, yet we have yet to explore the lowest location on earth. And that will be most likely even more monumental than reaching the peak of mt everest because of the possibility of findings that will be had along the way.