Flexible storage

A storage system for storing a fluid in an underwater environment, the storage system comprising:

• an outer casing and a first bladder, the outer casing including:
• an outer layer arranged to form a cavity;
• and
• an inner layer located within the cavity formed by the outer layer, the inner layer defining an interior surface of the outer casing, the cavity including a first cavity and a second cavity, the first cavity formed between the outer layer and the inner layer, the second cavity defined by the interior surface of the outer casing, the outer casing configured to receive and hold a first substance in the first cavity,
• wherein the first bladder is suitable for storing the fluid to be stored, the first bladder configured to receive and hold a second fluid, the first bladder being an inflatable and deflatable container located within the second cavity.

A method of providing a storage system for storing a fluid, the method comprising:

• providing a storage system comprising:
• an outer casing comprising:
• an outer layer arranged to form a cavity;
• and
• an inner layer, located within the cavity formed by the outer layer, and defining an interior surface of the outer casing,
• wherein the cavity comprises a first cavity and a second cavity, the first cavity is formed between the outer layer and the inner layer, the second cavity is defined by the interior surface of the outer casing, the outer casing is configured to receive and hold a first substance in the first cavity;
• and
• a first bladder suitable for storing the fluid to be stored, the first bladder configured to receive and hold a second fluid, the first bladder located within the second cavity;
• positioning the storage system in the desired underwater environment;
• inputting the second fluid into the first bladder such that the first bladder adopts a first inflated shape;
• and
• inputting a first substance into the first cavity such that, when the first bladder adopts the first inflated shape, the outer casing adopts a complementary shape to the first inflated shape.