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Yet their application in buoyant marine structures has remained elusive, as their open\u2010cell architectures inherently prevent flotation, even at densities below that of water. Here, we present the first buoyant metal\u2013polymer open\u2010cell hybrid lattice metamaterial. The design is guided by a novel skeletal density framework, built around an environment\u2010independent buoyancy parameter that excludes externally accessible porosity. The resulting hybrid architecture combines Ti\u20106Al\u20104V hollow\u2010strut lattices (HSLs)\u2014fabricated by laser\u2010based powder bed fusion (PBF\u2010LB)\u2014with expandable polyurethane (PU) foam injected into the internal channels of each strut. This architecture retains external open\u2010cell permeability while achieving skeletal densities below 1.0\u00a0g\/cm\n                    <jats:sup>3<\/jats:sup>\n                    , enabling reliable buoyancy prediction and control. Real\u2010world applicability is demonstrated using a Ti\u20116Al\u20114V+PU hybrid buoy that floats stably in natural seawater. This hybrid architecture exhibits\u00a0higher specific strength than conventional marine materials such as high\u2011density polyethylene (HDPE) and 316L stainless steel (SS316L). Seawater immersion tests further demonstrate corrosion resistance and water\u2011exclusion capability. Finite\u2011element simulations elucidate fracture initiation and predict failure modes consistent with experimental observations. Importantly, these hybrid buoyant architectures preserve flotation even after severe structural damage. This work introduces a new class of buoyant metamaterials and establishes skeletal density as a general design principle for open\u2011cell structures in targeted liquid media.\n                  <\/jats:p>","DOI":"10.1002\/adma.74641","type":"journal-article","created":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T04:54:57Z","timestamp":1787979297000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Breaking the Surface: Buoyant Metal\u2013Polymer Open\u2013Cell Hybrid Lattice Metamaterials"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4178-9645","authenticated-orcid":false,"given":"Jordan","family":"Noronha","sequence":"first","affiliation":[{"name":"Centre for Additive Manufacturing, School of Engineering RMIT University  Melbourne Victoria 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