In Tyumen, next to the Eternal Flame memorial, or the nearby Stone monument, or at the entrance to the City Duma museum (or in all three places), street time capsules will be installed with secure safes allowing people to drop letters addressed to future generations—either open messages to everyone or personal ones to their direct descendants. Letter or postcards (larger items can be checked by museum staff) are dropped into the so-called “time mailboxes” (another name for the street time capsules), each one indicating the year of delivery to the recipient. This is how it will look. Ten mailboxes are lined up next to each other, and each displays the year of delivery: 2030, 2045, 2050, 2060, 2070, 2080, 2090, 2100, 2110, 2120. After being dropped into the mailboxes, all letters are placed inside waterproof and fireproof safes in semi-automatic mode—not immediately, but after some time to make sure that the paper is not contaminated with a fungal infection (an expert, not necessarily a living person, maybe an AI robot, will check the material for long-term storage potential). The safes can be opened on the day of the city or at New Year, depending on the delivery date indicated on the safe. The exact opening date will be specified on the individual mailbox... The mailboxes will also specify the requirements for the message material. For durable media, such as birch bark, mailboxes with delivery dates stretching into the fourth millennium can be provided. Messages on birch bark should be imprinted so that they are still legible after thousands of years.