What facts indicate that Minos Crete was a powerful country?

We know from ancient history that the Minoan civilization, whose habitat was the island of Crete, was very developed in every sense. Science, craft and construction developed there. The cities had roads, sewers, water supplies, large and wealthy palaces. The Minoans had a strong army. True, the catastrophe that happened on the border of the 16-15th century BC undermined the power of the once mighty civilization and caused its decline.