It's easy to forget that the TARDIS is a sentient being.Its motivations mostly line up with the Doctor's, but the Time Lord isn't always aware of what the TARDIS knows and why it acts the way it does.

The Doctor's TARDIS makes a sound in the Doctor Who season 14 finale it's made before, and it reveals a lot about Sutekh's fearsome power.

The TARDIS is clearly a sentient ship and seems to actually be alive. At one point, it transforms into a woman and we get to hear its “voice” and get a peek into its “soul.” ...

There have been small but satisfying changes too — such as "The Doctor's Wife," an episode in which guest writer Neil Gaiman revealed that the sentient TARDIS had been leading the Doctor around ...

The TARDIS is clearly a sentient ship and seems to actually be alive. At one point, it transforms into a woman and we get to hear its “voice” and get a peek into its “soul.” ...