My guess is low, the deepest points are specific trenches related to intersecting tectonic plates and are of relatively higher scientific interest so many have

My guess is low, the deepest points are specific trenches related to intersecting tectonic plates and are of relatively higher scientific interest so many have been mapped. Its unlikely there is just a giant hole somewhere random. The trenches are way deeper than the ocean floor https://education.nationalgeographic.org/resource/ocean-trench/ https://education.nationalgeographic.org/resource/ocean-tren... and the deepest on e is quite deep, maybe there is a slightly deeper point in the deepest trench? I'm not a ocean floor expert though.