Disclosed is a method for manufacturing a flexible three-dimensional structure, characterised in that it includes the following steps: preparing a temporary mould defined by a peripheral surface; positioning a support structure on at least one portion of the peripheral surface of the temporary mould; decomposing the temporary mould; and extracting the decomposed temporary mould.

A self-righting underwater escape and surface survival suit includes an ascent hood and an inflatable bladder in fluid communication with the ascent hood. Breathable air from the vessel is used to inflate the inflatable bladder for ascent to and/or survival on the water surface. During ascent, breathable air is provided to the ascent hood from the inflated inflatable bladder. The inflated inflatable bladder is configured to provide self-righting of the wearer upon surfacing and to support the wearer on the water surface, even if the wearer is incapacitated or the ascent hood is opened.