When Hank gets in the water with Namu wearing a wet suit, he is not wearing a scuba tank. In the next scene, the tank is visible. In the following scene, he is not wearing the tank again.
When Lisa runs to her mother coming out of her store, Kate already has her custom fitted wet suit top on underneath her sweater. After arriving at the cove, Kate runs to the trailer to change, and as a seemingly afterthought, grabs a pair of wet suit bottoms to change in to. When Kate runs down to the dock she's wearing her custom top, form fitting bottoms and neoprene booties, all of which fit perfectly, yet none of this would fit either of the two men stationed there (Hank or Deke).