What 3D printing materials should I use to make an underwater vehicle?

huh? way more detail needed.
how deep will this vehicle go?
"plastic hose", ah, what exactly is this?

Technically, a snorkeler is a submersible, I suppose.

Nevertheless, student postings belong in the student forum, please delete and post in the student forum

Nylon (Polyamide): Nylon is a commonly used 3D printing material known for its good strength and abrasion resistance, making it suitable for parts that need to withstand certain loads and environmental impacts. Its chemical resistance and wear resistance make it a good choice for manufacturing underwater equipment.

PETG (Polyethylene Terephthalate Glycol): PETG is a material with good strength and water resistance, suitable for applications requiring moisture resistance. It also has good yield strength and impact resistance.

ASA (Acrylonitrile Styrene Acrylate): ASA is a material with good weather resistance and UV resistance, suitable for outdoor and underwater applications. It has high heat resistance and chemical resistance.

TPU (Thermoplastic Polyurethane): TPU is a soft and elastic material, suitable for manufacturing parts that require flexibility and impact resistance. If you need parts with a certain degree of flexibility and waterproofing, TPU may be a good choice.