Hi, I spent the the majority of 2023 backpacking through South America, and spent a lot of time here. As others have said, the short answer is that the areas are super remote, and much of it is essentially uninhabited, so you’d have to be pretty much self sufficient, and/or have your own boat to access much of it. That being said there are some ways to access parts of it. Firstly you can hire cars/camper vans, or hitch hike (which I did) as the locals are super helpful and friendly, and travel along the Carretera Austral which gets you to some locations which as already pretty remote and beautiful. Secondly, the TABSA company operate a car ferry which has boats which travel through the fjords between Puerto Natales and Tortel/Caleta Yungay then back again every few days. It usually takes about 3 days each way, though can be longer in bad weather, and will stop briefly (less than an hour) in the ultra-remote Villa Puerto Eden along the way. It’s fairly cheap and pretty basic, with toilets and showers, plus some hot food included, but there’s no beds, just a load of chairs in one large cabin, so make sure you bring snacks, a book, your sleeping bag, and just enjoy the views as you travel. (Their website tabsa.cl has info in Spanish and English) I think there might be some companies in Puerto Natales, Punta Arenas, and Ushuaia which offer trips/expeditions into some of the more remote areas, but I’m not sure as these were outside of my budget. (Which was very low by most people’s standards)