The purpose of the Data Exploration Service is to allow the users of VesselAI to explore the available datasets, combine them and express complex queries on them. The service offers an environment through which the user can discover the available datasets, find information and metadata about them, and explore the underlying data by creating custom queries through an intuitive graphical interface with rich expressive capabilities.The goal of the service is to be simple to use, yet powerful enough to be able to describe a diverse set of queries upon the user’s request. Users unfamiliar with formal query languages, without any knowledge about the storage technology or the structure of the underlying data should still be able to describe complex queries on top of multiple datasets.