The item ID for Seaglide in Subnautica is:
seaglide
Converts torque into thrust underwater via propeller.
The spawn code for this item is:
spawn seaglide
The item command will add this item to your character's inventory. The item command for Seaglide is:
item seaglide
To unlock this item, use the following command:
unlock seaglide
If you wish to lock this blueprint, after having unlocked it, use the following command:
lock seaglide