Gadget & Vehicles
Base
The Octonauts has many vehicles which can help them to travel in different terrains and depths.
Octopod

Octopod
The Octopod is the HQ of the team, all the main crews live on it. It is a submarine, has a shape like an octopus and has a basement, a main body and four detachable pods. The main body contain The four pods can be used for different purposes, including the library, garden, kitchen, lab, gym. There is a launch bay pod in the basement. The various gadgets and Gups are storked in the Octopod. Octopod can travel to any ocean and any depth.
Octo-lab

Octo-lab
The full name of Octo-lab is deep-sea Octo-Lab. It was built by Tweak to be brought in the Midnight zone, deep into the Mariana Trench. Shellington and Dashi go to stay at the Octo-Lab at the Mariana Trench for one week. To serve the crews which worked in the lab, Tweak invited Octo-bot to take place of Turnip.
Gups
Gadget
Octo-Alert

The Octo-Alert is an emergency symbol to indicate whenever the Octonauts need to go on a mission or if there is an important update. It is seen almost everywhere inside all the Gups and the Octopod itself. It is in a small size (on octo-screens), on the Gups control panels, and a large size in the HQ. Captain Barnacles also has it on his Compass. You can always find it in the theme song of every episode.
Octo Max Suit

The Octo-Max Suit is a mixture of a diving suit and a Gup designed by Tweak. It is as strong as a Gup, but smaller than any of them. On the end of its robotic arms can be either two mechanic claws or one mechanic claw and a jackhammer. It is equipped with a front view camera, side view cameras, and a back view camera. It can be attached to Gups, via a docking port right on the upper back.
Octo-Compasses
The Octo-Compasses could be used to navigate and communicate. It functions as a regular compass with a camera lens on its back and also features functions typically found on a device such as an Octo-Tablet. The device is also equipped with a camera lens on its back and is almost always by the Captain’s side.