自掘坟墓

自 = 丶 + 目 : Mnemonic symbol: a hand mirror, which someone uses to look at themselves.

The Eye of Providence (目) is looking at itself (自) in a handheld mirror (自) in the space station's bathroom (Ø4). It think it's indeed looking very good, since Zorro (z) attached a petal (丶) to its eye (目).

掘 = 屈 + 扌 : Zeus (ju) heard that the elevator was built on the remains of an ancient civilization, so he plans to unearth (掘) any relics. He has quite high diopter (屈) though and so, unknowingly, with his toy claw (扌) he digs (掘) right below the pillars inside the entrance (e2), eventually leading to the collapse of the elevator.

坟 = 土 + 文 : Frankenstein's Monster (f) is digging its own grave (坟) right in the encampment's kitchen ((e)n2). While digging the grave it piles up a lot of dirt (土) which forms a small mound. Frankenstein's Monster plans to use a thick book (文) as a tombstone.

墓 = 土 + 莫 : After Mozart (莫) died, Malte Monkey (mu) built him a grave (墓) in the space station's bathroom (Ø4) out of clay (土). He even added a very fitting epitaph (墓).