Micro-/ nano-scale pits etched into aluminum tubes' interior trap air, creating permanent unsinkablilty even if severely damaged

https://www.eurekalert.org/news-releases/1113891

"mimics diving bell spider/ fire ant survival strategies traping air bubbles against their bodies to remain buoyant/ breathe underwater... stable air bubble forced to remain inside even if tube pushed vertically into water/ subjected to turbulent motion, due to central divider...remain afloat even after being riddled with holes, or placed at extreme angles... tubes up to 0.5m, scalable, linkable for larger load-bearing structures... shipping, buoys, floating platforms, harvesting wave energy to generate electricity"