Since 2006 , Polish researchers have found a number of bodies of Poles , prisoners killed in spring 1940 during the Katyn massacre . Apart from bodies , Polish researchers found everyday use things , such as a comb , on which the owner , an unknown Polish officer , carved several names , such as Franciszek Strzelecki , Ludwik Dworak and Szczyrad ... ( this potentially might be referring to Colonel Bronisław Mikołaj Szczyradłowski , deputy of commandant of Lwów 's defense in September 1939 ) . Also , a dog tag belonging to Sergeant Józef Naglik , soldier of the Skalat Battalion of the Border Defence Corps , was found at the same spot . All the names belong to the " Ukrainian list " of Katyn massacre victims , and serve as proof that Bykivnya is connected to the Katyn crime
Katyn massacre
Katyn massacre
Bykivnia graves