# [JavaScript (Node.js)], 45 bytes

<!-- language-all: lang-javascript -->

    _=>`_|__`.repeat(175).match(/.{70}/g).join`
    `

[Try it online!][TIO-jhvvr1ml]

[JavaScript (Node.js)]: https://nodejs.org
[TIO-jhvvr1ml]: https://tio.run/##BcFBEoAQFADQfSdh0VeLxkpXwQgx8g2mTXV2vRf1rZupofQ542GHE0OKXclXSgXVFqs7WflG4dLdnITBw5ePeQoRQ1aTGgZzw2QhoSeOUDp@ "JavaScript (Node.js) – Try It Online"

#Explanation : 

    _ =>                    // lambda function (argument passed to save a byte)
        `_|__`              // simple enough
        .repeat(175)        // repeat the above mentioned shape 175 times
        .match(/.{70}/g)    // simple regexp to match a shape 70 (something :) ) long 
        .join`\n`           // and join them on a new line

---
Simple enough. 

#Alternate version : 

# [JavaScript (Node.js)], 714 bytes

<!-- language-all: lang-javascript -->

    _=>`_|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
    ___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__
    _|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
    ___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__
    _|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
    ___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__
    _|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
    ___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__
    _|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|
    ___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|__`

[Try it online!][TIO-jhvvw4s1]

[JavaScript (Node.js)]: https://nodejs.org
[TIO-jhvvw4s1]: https://tio.run/##y0osSyxOLsosKNHNy09J/Z9m@z/e1i4hviY@nnLMRQ1D4uO5Rl0z6hoycML/5Py84vycVL2c/HSNNA1Nzf8A "JavaScript (Node.js) – Try It Online"

No explanation required. Simple hard coded.