sentences:  The net effect was a setback for the proponents of evolution.On 23 March 1875, at sample station number 225 located in the southwest Pacific Ocean between Guam and Palau, the crew recorded a sounding of deep, which was confirmed by an additional sounding.As shown by later expeditions using modern equipment, this area represents the southern end of the Mariana trench and is one of the deepest known places on the ocean floor.