HomeRecent Actions for Treaties for Which the United States is Depositary ...Antarctica Recent Actions hide Antarctica Recent Actions Depositary Actions - Treaty Affairs Office of Treaty Affairs Share Share this page on: Close Antarctica – Protocol on Environmental Protection – Notification of Deposit of Instrument; Colombia, Feb. 13, 2020 Antarctic Treaty – Notification of Deposit of Instrument; Slovenia, April 22, 2019 Antarctic Treaty: Annex V to Protocol on Environmental Protection – Notification of Deposit of Instrument; Belarus, November 4, 2019 Tags Antarctic Multilateral Treaties