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Boulder City

Boulder City

Similan Islands, Thailand

Depth
Depth Icon

33m

Visibility
Visibility Icon

10m - 30m

Entry
Boat Entry Icon

Boat

Experience Level

Advanced

About Boulder City
This scuba dive consists of Parrotfish, Napoleon Wrasse and Sharks

Boulder City Dive Info

Terrain & Features

Reef, Shark

Entry Type

Boat

Max Depth

33m

Visibility Range

10m – 30m

Experience Level

Advanced

Best Gas Mix

21% – 33%

O2
CNS Load (20 min)

13% at 31m / 34%

O2
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Marine Life
  • Napoleon Wrasse
  • Parrot Fish
  • Rays
  • Sharks
Weather Conditions
Water Temperature ℃
Dive Operators near Boulder City
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Location
Dive Site Hazards

  • Hidden Depth Variations — Complex reef topography can conceal depth changes, leading to unintended profile variations.

  • Distraction from Marine Activity — High fish activity can distract divers and delay depth or gas awareness.

  • Rapid Surge Direction Changes — Surge near reef structures can reverse direction quickly, pushing divers sideways into unexpected areas.

  • Situational Awareness Loss — Divers may fixate on sharks and lose depth or position awareness.

  • Subtle Behavioural Shifts — Changes in shark behaviour may be missed without active observation.

  • Blue-Water Reference Loss — Lack of visual references increases ascent and descent instability.

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