Description is definitely needed. We need to see the setting. We need to see what the characters look like. However weave it into the story. Dont make a whole paragraph about it. During the dialogue, try and give the characters a little more movement and personality. For example, X looked at G, an arrogant smirk on his face, "I can be underwater longer than any human could dream of... Ect." G rolled his eyes and muttered under his breath, "You don't have to be so cocky!"