Enriched air, containing over 21% oxygen (commonly 32% or 36%), extends dive time by increasing no-decompression limits, but it reduces the maximum safe diving depth.

VHF and HF radios can transmit messages to all stations within range. VHF (Very High Frequency) radio provides short-range communication suitable for coastal areas. HF (High Frequency) radio enables communication over much greater distances, often spanning entire continents.

Satellite phones provide private, point-to-point communication, enabling direct calls to individuals globally.

Emergency Position-indicating Radio-beacons (EPIRBs) are designed to automatically transmit distress signals to alert rescue services worldwide.

The final product:

• Plex Media Server is a a central streaming hub for all your media files (movies, TV shows, music etc).

• VPN provides a secure and encrypted connection to usenet.

• Lidarr, Radarr and Sonarr monitor usnet to download new movie, TV show or music releases.

• Prowlarr manages the usenet indexer.

• Sabnzdb manages the usenet downloads.