Soak is a new visualization of Mumbai's terrain. It presents Mumbai in an estuary, a fluid threshold between land and sea. It encourages design interventions that hold monsoon waters rather than channel them out to sea; that work with the gradient of an estuary; that accommodate uncertainty through resilience, not overcome it with prediction. It moves Mumbai out of the language of flood and the widely accepted trajectory of war with the sea and monsoon that this language perpetuates. It recovers the world of soak.