Eckenstein was the leader of the first serious attempt to climb K2 in 1902. The attempt was on the Northeast Ridge, and Aleister Crowley was also a member of the expedition. Upon arrival in India, Eckenstein was detained by British authorities for three weeks on suspicion of being a spy, and not allowed to enter Kashmir. He and Crowley were convinced that Martin Conway was responsible for trying to interfere with their attempt on K2, and only when they threatened to take the matter to the newspapers was Eckenstein released.