The article provides a detailed characteristics of the concept of marine scientific research on the grounds of the existing norms of the international law of the sea, normative acts of the Republic of Poland and in terms based on the most recent and significant scientific publications constituting the literature on the subject. One of the core studies being conducted by the Committee on the International Legal Status of Submarine Cables and Pipelines established in 2018 under the International Law Association is the field of application of UNCLOS standards to hydrographic surveys carried out as part of the process preceding the laying of submarine cables and pipelines. This paper presents a hypothesis on the separate treatment of the concept of marine scientific research and hydrographic surveys, and presents the legal impediments that the State or the laying company may face.

The objective of the research is to find low cost alternative for conventional recreational lagoons that consume water and energy used for desalination which is the only alternative for water treatment in most touristic villages all over the world. The study uses low cost recreational lagoon with new technology that use brackish water from deep wells and purify this water before entering the lagoon by controlled pulses and energy-efficient ultrasound filtration. This allows to maintain the water within pre-defined parameters, guaranteeing standardized water quality in all lagoons. The research introduces the lagoon new technology and its low cost design including feeding and drainage wells, second, the hydrographic survey-ing for the coastline in the study area, third water quality modelling for the production and injection wells, fourth, use SOBEK 1-2 Mathematical Model for determine the water depth and perspective water volume for the designed lagoon. The aim of this model: Determine the relation between the water depth and the water volume for the canal and the lakes. Sec-ond, calculate the evaporation rate from the surface, Determine the number and capacity of the water wells needed to fill the canal and the lakes, and Find out the relationship between the discharge and the time needed to circulate the water in the canal and the lakes to keep their water quality.

The results of the measurements from the observation well prove that the optimal discharge per each well is 0.022 m3·s–1. The construction of suggested new green technology lagoon are very low cost, completely environmentally friendly, in addition fulfils the highest standards of environmental safety.