<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><span>Thanks' Scott,</span></div><div><span>Do you know what the max depth rating for an empty Scuba O2 tank is. I suppose you could increase the rating by using only part of the volume and leave pressure inside them. A sub could carry several in that case since they are close to neutral buoyant. </span></div><div><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Saturday, July 1, 2017 8:25 AM, Scott Waters via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv4140869061"><div><div>Hank,</div><div>Alvin has all the O2 supply internally. Pisces has the mission O2 internally and emergency supply externally in special steel cylinders that are pressure tested to 1.25 max depth while empty.</div><div>Thanks,</div><div>Scott Waters</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="yiv4140869061composer_signature"><div style="font-size:85%;color:#575757;">Sent from my U.S. Cellular® Smartphone</div></div><div><br clear="none"></div><div class="yiv4140869061yqt0829650607" id="yiv4140869061yqt01771"><div style="font-size:100%;color:#000000;"><div>-------- Original message --------</div><div>From: hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> </div><div>Date: 7/1/17 9:59 AM (GMT-05:00) </div><div>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> </div><div>Subject: [PSUBS-MAILIST] O2 tanks </div><div><br clear="none"></div></div><div style="color:#000;background-color:#fff;font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px;"><div id="yiv4140869061yui_3_16_0_ym19_1_1498917491013_2542">Hi all,</div><div dir="ltr" id="yiv4140869061yui_3_16_0_ym19_1_1498917491013_2542">How do deep diving subs deal with external O2 supply. Does Alvin have external tanks for O2, are they super special tanks?</div><div dir="ltr" id="yiv4140869061yui_3_16_0_ym19_1_1498917491013_2542">Hank</div></div></div></div></div><div class="yqt0829650607" id="yqt57775">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>