Around 100,000 years ago, in what is now Italy, our Neandertal cousins waded out into the shallow coastal waters of the Mediterranean Sea in search of clams.
（大约10万年前，在现在的意大利，我们的尼安特德表亲蹚进了地中海沿岸的潜水，寻找蛤蜊。）
请问此处out如何理解？是否与wade构成短语动词wade out？可否直接用wade into？
