We've discovered the colossal squids, like you linked, as well as gigantic clams, giant isopods, and more. To go any deeper than that, you have to be extremely highly trained, or be in some kind of a vehicle, for which you need much, much more training for.īecause of these limitations, and the expense of commandeering submarine human-inhabitable vessels as well as ROVs, humans have, so far, explored less than five percent of the ocean. Humans can only dive unassisted (meaning with ordinary SCUBA gear and tanks, no vehicles or anything) up to 100 meters before nitrogen narcosis (the altered level of consciousness that results from breathing nitrogen under high pressure) sets in.
Your xkcd link gives a very, very good summary of just how incredibly vast the ocean is.
It's really deep- so deep that the average depth is about four thousand meters (two and a half miles). Any gigantic creature at the scale of what you're talking about would probably have been picked up by now. Initially monitored and tracked submarines during the Soviet era, but now is monitored by NOAA to track undersea sounds. There is also a long connected web of submarine recording devices called hydrophone arrays that are connected across the Atlantic Ocean called SOSUS. There are currently vast amounts of monitoring systems in place in the ocean right now, mostly put there by geologists to monitor changes in the ocean floor that might indicate tectonic shifts or marine landslides that would affect humanity. We make our world significant by the courage of our questions and by the depth of our answers.
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