Clank!: Sunken Treasures (Expansion)Clank!: Sunken Treasures. The challenge to prove your thieving skills has moved to new environments. Youd better know how to swim, as several rooms youll face have been completely flooded with water. Plus, of course, theres always an angry dragon to avoid Clank! Sunken Treasures is an expansion for Clank! A Deck Building Adventure. Players will explore two partially flooded maps with new Dungeon Deck cards, a new persistent monster to defeat, new