There is a large Wreck located in the Underwater Islands, suspended by two of the islands. There are a total of 5 Data Boxes here but two are hidden - you have to use the Propulsion Cannon to move a door and reveal a ladder. Be careful of the Bonesharks, they will destroy your Seamoth. Just outside the Wreck you can find another Data Box with the Creature Decoy.
Watch video Subnautica How to find the Repulsion Cannon and the Alien Containment online, duration hours minute second in high quality that is uploaded to the channel Just Diving 28 April 2021. Share the link to the video on social media so that your subscribers and friends will also watch this video. This video clip has been viewed 412 times and liked it 7 visitors.