SpongeBob underwater scene in Three.js

i've been testing DeepSeek v4.1 Flash 1017 for the past few hours. -> one shot, 31 minutes of autonomous execution -> only $0.22 -> the promising part is how far it can carry a task from a brief description without me steering every step. this is the kind of long-running execution that makes “just describe what you want” coding feel useful. this SpongeBob showcase is one of the results, a short prompt asking for a 30-second Three.js scene with water absorption, simulated physics, cinematic lighting and bubbles.