In ancient times, catamarans were a very popular vehicle on the water. They were invented by peoples living on the Indian Ocean. Currently, catamarans are mainly used for recreation. Rest on a catamaran is the most useful activity on the water - both relaxation and physical activity.
Thanks to plastic bottles, the old rotten catamaran gained a second life. All wooden elements were replaced with plastic bottles. And, in my opinion, this design has become easier and more mobile.
Absolutely all the old wooden elements were replaced with plastic bottles.
And even the passenger seat, too.
If you were lucky enough to get an old "dead" catamaran somewhere, then it will take you 20-30 empty plastic bottles and some free time to restore it. But then it will become the most favorite vacation on the water.