You need to obtain a TRV first. There are no transit visas for Canada. If you manage to get a TRV, and land in Canada, there is no reason to destroy your passport. If you are using a fake passport, you will find that will cause you significant issues. If it is genuine, present it to the immigration office when you claim asylum. Destroying your passport wouldn’t prevent them from deporting you if your claim is rejected. They just apply to Bangladesh for a temporary travel document.
Keep in mind that with the current travel restrictions, it is unlikely you will be allowed to travel to Canada until the travel bans are lifted.
Keep in mind that with the current travel restrictions, it is unlikely you will be allowed to travel to Canada until the travel bans are lifted.
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