ARMENIA wasn't Hospital ship, she was "wounded transporter" armed with Flaks. She sail with escort of two MO-cutters in last voyage. There is German's (Luftwaffe) reports about this case on
https://wwii.germandocsinrussia.org/ru/nodes/1-fond-500 (500-12452-0172). In Russia recently some people argued about bomb's hit in ship, not torpedoes. But there still no firm evidence against torpedo-version.