The antonyms for the word "more deepsea" would be those that indicate shallowness or surface-level features. Some potential antonyms could include "shallow," "superficial," "surface-level," or "lacking in depth." These terms all suggest a lack of complexity or depth, or an absence of the kinds of features and characteristics that would be found in deep sea environments. By contrast, the term "more deepsea" implies something that is richly detailed, diverse, and mysterious, with a range of different depths, temperatures, and ecosystems. Antonyms for this term thus suggest the opposite: a lack of such complexity, depth, or diversity.