"Dry Silo" method. Mylar across top of tube ripped/burst as the pressure built inside plus the nose cone had a toothpick in the tip. Model may have traveled thru too much water, may have been 8 to 10 feet of water (Pool was at least 13 feet deep there). Usually didn't have it anchored that deep and all other flights were vertical.. I shot this from the high dive board's ladder. The Pool water was "dank" because the city left it filled with water over winter.