How many Baseball Hall of Fame submarine pitchers are there?

Answer 1

The only pitcher in the Baseball Hall of Fame that threw primarily submarine is Joe McGinnity who pitched 10 seasons (1899-1908) for the Baltimore Orioles (both the National League Orioles and American League Orioles), Brooklyn Superbas, and New York Giants. He claimed the submarine delivery was easy on his arm and he led his respective league 6 seasons in games pitched and 4 times in innings pitched, his highest being an NL leading 434 innings in 1903 when he pitched in 51 games, had 44 complete games, and 31 wins, also all tops in the National League. In the month of August, 1903 he pitched complete games in both games of a doubleheader three times. He followed the 434 inning season in 1903 by pitching 408 innings in 1904. 1904 was his best season as he led the National League in innings pitched, wins (35), ERA (1.61), games pitched (51), shutouts (9), and saves (5).

After his MLB career he pitched in the minor leagues until the age of 54 and, depending whether you believe the stats, ended his career with 480 victories (246 in MLB and 234 in the minors).

His nickname was 'Iron Man' but it came from working in iron mines prior to his MLB career and not from his ability to pitch countless innings.