If I am diving and hear a humpback whale song, how far a distance could the whale be from me. I hear them a lot in the Turks and Caicos. On behalf of my sister, Jan. Dear Irene, Your sister is lucky to have such an incredible experience. Close to shore where people usually dive, sound doesn't travel as far as it does in the open sea. This is due to the noise of waves, currents, absorption of the bottom, etc.
Humpbacks also sing at fairly high frequencies, which further limit the distance their voices carry.
I searched the primary literature for a reliable reference for the distances humpback songs carry. The best I found was a 1998 paper by Best, Findlay, Sekiguchi, Peddemors, Rakotonirina, Rossouw and Gove about humpbacks in the southwest Indian Ocean. These researchers, using a an omnidirectional hydrophone, periodically detected humpback songs at 18 of 19 stations. The exception was a station 17 nautical miles offshore in a water depth of 500 m. Three hours later, an acoustic station inshore in a water depth of 46 m revealed the presence of many singers.