Hi. It seems like if you summon/take of a TARDIS near an ocean, you can see through the ocean if you look at it through the landing/taking of TARDIS

I tried to send an image but it doesn't allow me

The translucency issue is a limitation of Minecraft's rendering engine, it applies for a lot of tile entity models as well (such as chests, light boxes, signs, or banners). Ed has tried a fair bit to make it look nicer, but nothing so far.