In the description of Bloop Analog Horror Part 5, it states that The Evil Submarine was able to reach the bottom of the second hole without getting destroyed by the pressure. In this community post, it is stated that the bottom of the second hole is 22 kilometers deep. So 222,916,000 Joules per cubic meter. Average submarines are in the range of 18,000 to 47,000 cubic meters, so I'll use the arithmetic mean (32,500 cubic meters), so 222,916,000x32,500=7,244,770,000,000 J or 1.73154 kilotons of TNT (Low 7-C/Small Town level)