<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_1_1496782788307_2497">Greg,</div><div id="yui_3_16_0_1_1496782788307_2497">Elementary's hull is 1 inch thick and 48 inches ID from 516-70 and pressed to meet ABS sphericity rules. The hatch land is 2 inches thick and conical. The sphere is rated for 3,000 feet and tested to 2,800 feet at Nuytco. I only went to 2,800 feet because that was the chamber limit.</div><div id="yui_3_16_0_1_1496782788307_2497">Hank</div></div></body></html>