CASTINE — Jean Devereux, 81, had heard about the disappearance of a cargo ship near the Bahamas last Thursday. When she found out Sunday morning that four of the 33 lost mariners are graduates of Maine Maritime Academy, she reacted with disbelief at first. Then she wept. And then like a lot of people here and on the nearby Maine Maritime Academy campus, she offered reasons for hope. “Those kids are so well trained.