The Eagle Well-Spring by Alaksiej Zarycki was dedicated "to the memory of Captain Hastel."
It includes the lines
... For the eagle's grave came not seeking!
That's where Hastel's heart ceased, no more to
Beat after all its striving - men tell it -
On that spot there flows, ever-pouring
From the plumbless depths, a clear well-spring
Who was Captain Hastel, and why was the poem dedicated to him?