I worked on the Ekofisk complex, Abuskjell (now shut down ) off Norway and to get from the outlying platforms to the central you can use a bike over the link platforms! So big! The accommodation on Hedrun,Valhala etc is the size of a hotel! We are now talking nearly 1 million tonnes of the newest ones. They are taken to sea by tugs. However, Norway cannot send crude oil direct because of a deep gorge called the continental shelf. Another giant was Statfjord A which pioneered the way to these giants.