checking if the player has lost sonardevices - line is the last line of the while loop that started on line decrement the sonardevices variable because the player has used one if the player keeps missing the treasure chestseventually sonardevices will be reduced to after this lineexecution jumps back up to line so it can re-evaluate the while statement' condition (which is sonardevices if sonardevices is then the condition will be false and execution will continue outside the while-block on line but until thenthe condition will remain true and the player can keep making guesses if sonardevices = print('we\'ve run out of sonar devicesnow we have to turn the ship around and head' print('for home with treasure chests still out theregame over ' print(the remaining chests were here:' for xy in thechests print(% % (xy)line is the first line outside the while loop when the execution reaches this point the game is over if sonardevices is you know the player ran out of sonar devices before finding all the chests and lost lines to will tell the player they've lost the for loop on line will go through the treasure chests remaining in thechests and show their location to the player so that they can know where the treasure chests had been lurking the sys exit(function if not playagain()sys exit(win or loseplayagain(is called again to let the player type in whether they want to keep playing or not if notthen playagain(returns false the not operator on line changes this to truemaking the if statement' condition true and the sys exit(function is executed this will cause the program to terminate otherwiseexecution jumps back to the beginning of the while loop on line and new game begins