The aim of the project is to develop a cost-effective material for 3D printing underwater based on geopolymers to safely contain hazardous substances and eliminate the risk associated with dangerous shipwrecks.  The main objective of the project is to develop high-performance composites with functional properties for technical applications such as the construction and marine industries. The planned result is an environmentally friendly, high-performance composite material for underwater applications. It is the answer to the need for more durable materials to protect hazardous wrecks and critical underwater infrastructure from corrosion and also for construction purposes in harsh environments, including highly polluted environments, including protection from hazardous cargo in wrecks.  The result will be potentially interesting for government institutions planning to increase activities related to environmental protection (protection of hazardous wrecks), as well as for private companies, including underwater works in polluted environments.