# The VIRTUALDiver Project. Making Greece's Underwater Cultural Heritage Accessible to the Public
## 3 Results and Discussion
### The Platform
#### 3.1.3 System's Architecture  
The system's architecture (Figure 8) comprises two subsystems:  
1. The data collection subsystem is based on internet technologies and aims at creating, processing, and maintaining the data prototypes required for subsequent use by the interaction and experience design subsystem. Through this subsystem, the user is able to upload all the necessary multimedia material to a database in order to create interactive experiences.
2. The subsystem of interaction, experience design, and content presentation uses the capabilities provided by Unity 3D development platform, to design and present interactive experiences. For this purpose, techniques and tools for interaction with multimedia content are developed to facilitate the design team in the production process of interactive narratives. Through simplified procedures, the design team is able to incorporate the necessary multimedia initially imported in the data collection subsystem, as well as the respective geomorphological terrain into the software. As a result, the design team is able to create various types of interactive experiences based on pre-designed paths. Depending on the design that is followed for the interactive experience, the final result can be exported to the corresponding medium (VR goggles, tablets, etc.). The key element of the platform is that it provides mechanisms for the implementation of interactive experiences with dynamic content, separating the collection and configuration of multimedia material from the development and visualization of the interactive experience. It also enables the sustained updating and processing of the multimedia material by the design team, according to the requirements and needs of the customer-user as well as the design specifications that have been set or updated. The subsystem of interaction, experience planning, and content presentation provides the design team with the following capabilities: * Multiple ways of interacting with the content, such as slideshow, panoramic photos, videos, audio clips, text, timeline, specially designed museo-pedagogical applications, etc. * Multiple ways of presenting the content, such as Virtual Maps, Routes, Geographical Areas, Through Thematic Categories, etc. * Future expansion and additions, without necessary changes in the existing material.  
The designed tools, mentioned above, are the Interaction Components, and have the ability to utilize the multimedia material gathered in the database. A series of interaction components are added to each Point of Interest (POI), thus giving it a dynamic substance for each defined narration. These tools offer the ability to manage multimedia content in a simplified way without requiring specialized programming knowledge (Figure 9).  
The Interaction Components offer the possibility of updating/adding new ways of interacting with supervisory content both in different media (virtual reality glasses, tablets, etc.), as well as in different environments (VR, AR, standalone desktop applications, etc.). As a whole, they form the Library of Interaction Components, where they can be combined and create interactive experiences in the narrative scenarios of the selected routes.