פיקוח נפש pikuach nefesh

dear rabbi halperin,

my name is eli feit. i met you on the recent cruise to the greek isles. i am interested in the material you said you have on pikuach nefesh and particularly the stories you related at your first lecture about your interaction with rav auerbach and rav elyashav. thanking you in advance. also, my thanks to you for your interesting presentations which made my vacation more enjoyable.