What is the lowest hemoglobin level that you have seen in a patient that was still alive?

Just out of curiosity and for fun.

The lowest I have ever seen was 2.1 gm/dL in a lady of about 55 years of age with aplastic anemia who had missed a few of her regular transfusion appointments. She was shockingly healthy given her low Hb levels. She was admitted with a chief complaint of cough with sputum and much to my shock she did not complain of any severe fatigue etc. Only had loud heart sounds and a ejection systolic murmur from hyperdynamic circulation. No other cvs findings.

According to one of my professors, the lowest he had ever seen was around 1.7 or 1.8 gm/dL in a lady with IDA and menorrhaiga.

Anyways, what are some of the lowest Hb values that you've come across?