Here, in part, is what happened to the other two.
The 1937 over the pole flight was commemorated in 1975 with the erection of a monument in the United States that hailed a Soviet achievement. ANT-25 crew members Georgiy Raidukov and Alexander Belyakov, who were then generals, attended the ceremonies. Valery Chkalov was killed in 1938 while test flying a new aircraft.
From the link in A30yoyo's post "The Chkalov transpolar flight marker"