Bec - Underwater Environmental (and possible interactive) concepts

More for underwater environments. First image contains kelp background concepts. Top left corner is a trial for light on a water surface (looking up from below).

The coral/sea grass concept could work as either a foreground or background element. The bulky rock mass is an edge frame trial. Floating rubbish. Small silhouettes of sea animals in the background serve as possible foreshadowing to what the player may expect to encounter later in the level. 

Possible interactive elements. Underwater volcano, oxygen tank, life jacket, industrial pipe pumping out sludge. The sunken ship and old diving helmet may simply serve as background elements.