Not to whom you are responding to, but I spent years at sea and can confirm that they do in fact sink - some wash up on shore. Take it for what you will. Edit:

Not to whom you are responding to, but I spent years at sea and can confirm that they do in fact sink - some wash up on shore. Take it for what you will. Edit: https://www.huffpost.com/entry/med-taipei-shipping-container-study_n_5593719 https://www.huffpost.com/entry/med-taipei-shipping-container...