YouDive educational guide · References checked 30 September 2026 · Independent instructor and medical review pending. This library does not provide certification, individual medical clearance or a dive plan.
Understand the risk
Propellers, moving hulls and ladders can injure divers. Pickup arrangements vary between vessels and conditions. Do not assume the skipper can see a submerged diver or that a ladder will remain still in a swell.
Boats, ladders and propellers: what connects
Entry
Crew must be ready
- Wait for the agreed instruction
Pickup
Vessel approach matters
- Use the briefed procedure
Ladder
Can move with waves
- Follow crew guidance and spacing
Concept relationships from this lesson. These are discussion points, not a dive profile or emergency treatment sequence. Read the cited sources; qualified review is pending.
Put the knowledge into practice
Listen to the vessel briefing and follow crew directions for entry, pickup and boarding. Keep clear of operating propellers. Learn suitable surface signalling and maintain awareness of other divers near the ladder.
What to notice and discuss
| Consider | Why it matters | Planning or learning response |
|---|---|---|
| Entry | Crew must be ready | Wait for the agreed instruction |
| Pickup | Vessel approach matters | Use the briefed procedure |
| Ladder | Can move with waves | Follow crew guidance and spacing |
PAUSE & THINK
What would you do?
A diver swims towards the stern before the crew signals that boarding is ready.
Reveal the discussion answer
Wait for the crew’s safe boarding procedure rather than approaching an operating vessel uninvited.
Frequently asked questions
Does a surface marker make me visible to every boat?
No. It improves signalling but does not guarantee detection or safe vessel behaviour.
Sources & further reading
DAN: Operational safety resources ↗DAN: Safe diving practices ↗These sources inform this guide; their organisations have not reviewed or endorsed YouDive.
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