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Interesting but maybe they could do more, like add a tee or a cross and connect a skylight or second floor? I had an idea of using concrete pipe for a human-sized 'hamster habitat'. Nobody's done it yet AFAIK but I'm thinking it would be a good candidate for an earth-sheltered space..

the website of these hotels say its free, you only have a bed, light and power to recharge your gizmos. you need to use public bathrooms in the area. below is what i pasted



dasparkhotel is conceived and implemented primarily as a hospitality tool.

It is constructed from repurposed, incredibly robust drain pipes.

The external simplicity surrounds an unexpectedly comfortable interior - full headroom, double bed, storage, light, power, woolly blanket and light cotton sleeping bag. All other hotelery devices (Toilets, showers, minibar, cafe, etc) are supplied by the surrounding public space.
From May through October
the simultaneously functional and comfortable concrete sleep-pipes offer the chance to experience a place in a totally new way.

Personal door code
Upon booking you will receive a code to allow entry to your personal suite.

For the period of your stay dasparkhotel remains your all hours access safety zone - the charger for your personal energy reserves.

The chance to safely store your luggage and recharge portable electronic devices allows complete freedom of movement.

Infrastructure
Because we obtain sanitation, breakfast and other hotel facilities from existing public infrastructure, it is possible for us to work with the very simple, user-friendly "pay as you wish" system. A night in dasparkhotel costs just as much as you can afford or want to pay.

Costs
We see "pay as you wish" as a system where customers leave a Euro amount that they can afford and with which they wish to support our project.

Reservations
Reservations can be made at www.dasparkhotel.net/reservation at any time.