If you need to store your luggage in a safe place, there are numerous facilities in Ushuaia with lockers. There you'll be able to lock away your belongings.
Address: Gobernador Paz 3223.
Website: turismoenushuaia.com
Address: Av. San Martín 409
Phone number: +54 2901 437073
Ground floor from 10 am to 10 pm. Online registration - https://wekeep.app/
Address: Rivadavia 132
E-mail: ulockertdf@gmail.com
Website: Ulocker.ar (prior reservation online)
Cerro Castor is a winter center located at 26km. away from Ushuaia's city on National Road 3. They have lockers for winter equipment inside their facilities.
Phone number: +54 2901 537094
Instagram: guarderiadequipajeushuaia
Address: Gobernador Paz 710
Phone number: +54 223 6199099