How to encrypt all internal hard drives and unlock them at startup?

Hello everyone,

basically, I would like to encrypt my three inteal hard drives and have them unlock at system start so they are immediately usable, but unreadable from the outside.

I am currently in the process of installing Ubuntu 16.04 and saw that the installer offers an option to encrypt the installation drive with LVM. However, this does not seem to include other inteal physical drives. Is there any way to include my two other drives in this encryption system and have them unlocked at the splash screen or user logon as well? I would prefer to do this without installing additional software afterwards, if this is even possible.

I would be very glad about any advice on how this can be done.

Kind regards!